Roundup of interesting articles, May 2018

States redrawn to match daily commute patterns.

After a long hiatus, Richard Branson’s “Spaceship Two” returned to the air and made a successful test flight. If all goes well, he could be sending passengers into space in a few years.
https://www.washingtonpost.com/news/the-switch/wp/2018/05/29/richard-bransons-virgin-galactic-just-got-another-step-closer-to-flying-tourists-to-space/

Here’s an in-depth analysis of what it would take to make a solar sail spacecraft that could reach 20% of light speed and go to Alpha Centauri. The engineering challenges are formidable, but not insurmountable.
https://arstechnica.com/science/2018/05/the-material-science-of-building-a-light-sail-to-take-us-to-alpha-centauri/

Instead of there being a multiverse, what if there’s only one universe, but different realms within it have distinct ground states?
https://www.theatlantic.com/science/archive/2018/04/dont-be-afraid-of-the-multiverse/559169/

Crews scanning the ocean floor for Malaysia Air Flight 370 stumbled upon two shipwrecks from the late 1800s.
https://www.apnews.com/77038501654b4eb7925d567d37cb7ab8/Historians-name-2-Indian-Ocean-19th-century-shipwrecks

An ocean buoy detected a 78 foot high wave south of New Zealand, making it the largest wave ever recorded in the Southern Hemisphere. As the number and density of automated sensors like buoys, weather stations, and drones grow, so will data and film footage of extraordinarily rare occurrences and life forms. In 20 years, you’ll be able to ask your computer to “Show me everything weird that happened today” and spend the next several hours watching video clips from around the world, including places devoid of humans.
https://newatlas.com/record-wave-southern-ocean/54602/

BAE hopes to build a solar-powered, autonomous plane that could stay aloft for 12 months. It could do aerial surveillance and some functions currently performed by satellites.
https://www.defensenews.com/unmanned/2018/05/03/bae-systems-partners-with-drone-specialist-for-solar-powered-uav/

“Ocado” is a British grocery store chain that has no brick-and-mortar retail stores and only does home deliveries. Their food warehouses, where groceries are stored and packaged, are heavily automated and use hundreds of robots.
http://www.bbc.com/news/technology-43968495

A fascinating piece that highlights some of the less-obvious ways autonomous vehicles will change the world.
https://arstechnica.com/cars/2018/05/self-driving-technology-is-going-to-change-a-lot-more-than-cars/

It will also probably be easy to program autonomous vehicles to drive in ways that use as little fuel as possible. Many human truck drivers have a hard time keeping up these habits because they require near-constant focus and patience. Moreover, since machines don’t need to sleep, autonomous trucks could structure their routes in such a way that they were mostly on the roads during non-peak hours, like the middle of the night, meaning fewer traffic jams for everybody and less wasted gas.
http://www.fleetowner.com/fuel_economy/fuel-economy-0701

One of the NYT’s auto experts thinks gas-powered cars will be obsoleted by fast-recharging electric cars within five years, and sales of both will sharply shift to reflect this. Without giving a deadline for autonomous cars, he drops a lot of hints it will take substantially longer than five years to become mature and ubiquitous.
https://www.nytimes.com/2018/05/16/technology/personaltech/electric-self-driving-flying-cars.html

‘”I’ve been at [Consumer Reports] for 19 years and tested more than 1,000 cars, and I’ve never seen a car that could improve its track performance with an over-the-air update,” Jake Fisher, director of auto testing at Consumer Reports, said in a blog post.’
http://money.cnn.com/2018/05/30/technology/consumer-reports-model-3-recommended/index.html

A famous and still thought-provoking analysis of the cost-effectiveness of 500 different safety/health interventions. Yes, you can put a price on human life.
https://www.slideshare.net/myatom/tengs-et-al-cost-effectiveness-of-500-life-saving-interventions-2776562

Will America’s new “Right to Try” policy that allows terminally ill people to take drugs still in Phase II clinical trials help much? Probably not, and not just because only 10% of drugs prove themselves effective during Phase II.
http://blogs.sciencemag.org/pipeline/archives/2018/05/25/federal-right-to-try

The FDA shut down two “stem cell therapy” clinics after their treatments for people with vision problems made several of them go blind.
https://www.washingtonpost.com/news/to-your-health/wp/2018/05/09/fda-seeks-injunction-to-stop-two-stem-cell-companies-after-patients-blinded/

The reality about “personalized cancer treatments” is that only 15% of cancer patients are eligible, and only 1/3 of them could benefit from it.
http://blogs.sciencemag.org/pipeline/archives/2018/05/02/cancer-sequencing-hype-and-reality

‘The National Cancer Institute’s new goal is to “eliminate suffering and death due to cancer” by 2015.’
–NCI Director Dr. Andrew von Eschenbach, 2003
https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(06)68718-7/fulltext

A meta-analysis of women who got the HPV vaccine proves beyond doubt that it works and has no side effects.
https://www.cnn.com/2018/05/08/health/hpv-vaccines-cervical-cancer-review/index.html

A meta-analysis of fMRI studies that “proved” male and female brains operate differently suggests they might have been flawed, and researchers might have failed to publish null findings.
https://www.nature.com/articles/s41598-018-23976-1

People who go to art school are likelier to get schizophrenia, bipolar disorder, and depression.
https://www.cambridge.org/core/journals/the-british-journal-of-psychiatry/article/artistic-creativity-and-risk-for-schizophrenia-bipolar-disorder-and-unipolar-depression-a-swedish-populationbased-casecontrol-study-and-sibpair-analysis/B3FFC439154C19A01F779365AF16B3C7

Electroconvulsive therapy has been unfairly maligned, and is actually the most effective treatment for some people with severe mental illness.
http://www.bbc.com/future/story/20180502-the-surprising-benefits-of-electroshock-therapy-or-ect

MDMA, commonly called “Ecstasy,” has proven a remarkably effective treatment for PTSD in preliminary clinical trials. If all goes well, it could be legal for medicinal use in 2021.
https://reason.com/archives/2018/05/02/a-forbidden-remedy-for-veterans-nightmar

America’s early school start times are awful for students and their parents. As early as 1913, the practice’s ill effects on sleep, learning and quality of life were noted. Why do we do it anymore?
https://schoolstarttime.org/early-school-start-times/

Machines hit a new milestone in automating chemical synthesis work.
http://blogs.sciencemag.org/pipeline/archives/2018/05/14/give-it-to-the-machines

Amateur chemist claims to have made a distilling process that can “age” whiskey the equivalent of 20 years in six days. Whether or not his claim is genuine, I think someone will make it work someday.
https://reason.com/reasontv/2018/05/09/bryan-davis-lost-spirits-distillery-booz

Did Betamax actually have better picture quality than VHS? This side-by-side footage analysis suggests not.
https://www.youtube.com/watch?v=_oJs8-I9WtA

“[Intelligence] is a spectrum of abilities since there are many different goals you can have, so it makes no sense to quantify something’s intelligence by just one number [like an IQ score]. To see how ridiculous that would be, just imagine if I told you that athletic ability could be quantified by a single number, the ‘Athletic Quotient,” and whatever athlete had the highest ‘AQ’ would win all the gold medals in the Olympics.”
https://youtu.be/p9eLpRbRk4c

Some alternatives to America’s state borders. I’ve long been a fan of breaking up states with big populations and merging states with small populations to help “even things out.”
https://www.quora.com/Do-U-S-state-borders-make-sense-for-modern-times

There’s substantial evidence that American judges allow their personal political and cultural views to influence their court rulings. Though judges claim to be coldly analytical and objective, it does actually matter whether they’re Republicans or Democrats.
https://www.apnews.com/cc39185fe15346d7a7c7c021bc3d4d90/Is-Trump-right-about-judges’-leanings?-Maybe,-review-shows

Here’s a supposedly genuine military report about the 2004 encounter between a U.S. Navy F/A-18 and a UFO off the coast of San Diego. The sighting was first described in a December 2017 New York Times article. The report deduces that the UFO could change altitude at ballistic missile speeds, was nearly invisible to radar, and might have had a cloaking ability on the visible light spectrum.
https://media.lasvegasnow.com/nxsglobal/lasvegasnow/document_dev/2018/05/18/TIC%20TAC%20UFO%20EXECUTIVE%20REPORT_1526682843046_42960218_ver1.0.pdf

Between new plane purchases and upgrades of existing planes, the U.S. Navy plans to have at least 650 “Block 3” Super Hornet F/A-18E’s and F’s by 2025. They’re better than the current “Block 2” Super Hornets in every way.
http://www.thedrive.com/the-war-zone/21045/here-is-boeings-master-plan-for-the-f-a-18e-f-super-hornets-future

And in classic fashion, the Navy is dumping its worn-out, excess F/A-18C and D Hornets (note the lack of “Super”) on the Marine Corps. The Navy has 270 of these older fighter planes and will give the Marines 136 of them, mostly to be cannibalized for spare parts. The Navy’s final 134 Hornets will probably be transferred in the future as it gets more Super Hornets and F-35C’s.
http://www.thedrive.com/the-war-zone/19040/navy-to-slash-legacy-f-a-18-hornet-fleet-to-prop-up-beleaguered-usmc-squadrons

The hardships of a Marine Corps F/A-18 mechanic struggling to fix planes that are older than he is. At some point, everything wears out, and the time and money spent on maintenance gets so bad that it’s actually cheaper to buy a newer replacement.
http://www.thedrive.com/the-war-zone/20019/life-on-the-flight-line-confessions-of-a-u-s-marine-f-a-18-hornet-maintainer

Brazil has an 81-year-old river patrol ship still in active service. It originally had a steam engine and now has a helipad.
http://warisboring.com/one-of-the-worlds-oldest-military-ships-is-sailing-down-a-river-in-brazil/

Israel has developed an affordable upgrade kit that converts Soviet-era multiple launch rocket systems into guided weapons.
http://www.thedrive.com/the-war-zone/21023/israeli-made-bolt-on-kit-turns-122mm-grad-artillery-rockets-into-precision-weapons

Israel also used small quadcopter drones to snag incendiary kites released by militant Gazans who were trying to randomly start wildfires across the border in Israel.
http://www.thedrive.com/the-war-zone/20853/israel-uses-drone-racers-to-down-incendiary-kites-and-drones-to-dispense-tear-gas-over-gaza

Some Korean War-era U.S. M41 light tanks are still in service in Third World armies.
http://warisboring.com/m-41-tanks-are-museum-pieces-and-still-in-service/

Indonesia has bought several brand-new U.S. AH-64E attack helicopters and will fly them alongside their old Soviet Mi-35 helicopters.
http://www.janes.com/article/80207/update-indonesia-formally-accepts-first-apache-helos

Greece is upgrading its F-16s and plans to keep them in use until 2048. The prototype F-16 first flew in 1974.
http://www.janes.com/article/79703/update-greece-moves-ahead-with-f-16-modernisation

Boeing got a patent for a detachable, automatic cannon that could be installed in the bomb bays of semi-stealth B-1 bombers, turning them into gunships. The U.S. military first experimented with this kind of weapons system in 1971. Prototype cannons were installed in the bomb bays of bombers made in the 1950s.
http://www.thedrive.com/the-war-zone/20782/boeings-been-granted-a-patent-for-turning-the-b-1b-into-a-gunship-bristling-with-cannons

The U.S. Air Force is heavily upgrading the cockpits of their F-15s.
http://www.thedrive.com/the-war-zone/21081/the-usaf-has-quietly-added-large-multi-function-cockpit-displays-to-its-f-15c-fleet

China has just launched its second aircraft carrier, which could be thought of as an upgraded copy of their first carrier, which was built by the USSR and launched 33 years ago. Does this milestone mean China’s shipbuilding prowess has surpassed Russia’s?
http://www.scmp.com/news/china/diplomacy-defence/article/2145890/chinas-first-domestically-built-aircraft-carrier-begins

Did you know you can build a somewhat OK bullet proof vest out of a thick textbook and a 1′ x 1′ ceramic floor tile?
https://youtu.be/ECug_76_NLg

The Basque Separatists have disbanded, thanks to an improved Basque economy (assisted by investment from Madrid) and a graying of the population. How many other ethnic secession movements could be defused with the same combination?
https://www.apnews.com/448d0d7510b0447abba9597c9c319f63/ETA%27s-bloody-history:-853-killings-in-60-years-of-violence

In 1872, English writer Samuel Butler published the book Erehwon. In it, the main character visits a futuristic, closed society that banned machines because they were improving too fast and people feared they would become smarter than humans and take over. Butler was inspired by Darwin’s Theory of Evolution and by the rapid industrialization he saw in England over his lifetime. It’s the earliest example of the the “robot uprising” trope I’ve seen.
https://www.marxists.org/reference/archive/butler-samuel/1872/erewhon/ch23.htm

A few bummer remarks about the state of artificial intelligence. FIRST: ‘The current ways of trying to represent the nervous system…[are little better than] what we had 50 years ago.’  –Marvin Minsky, 2013
https://youtu.be/3PdxQbOvAlI

SECOND: ‘Over the next 30 years, we’re not going to see Commander Data…there is an A.I. bubble right now and people are making a fundamental error on estimating how good A.I. is going to be [and] how quickly.’ –Rodney Brooks, 2017
https://youtu.be/ig1qaqyMIXc

THIRD: ‘I suspect that [building the first true A.I.] means getting rid of back-propagation…I don’t think [back-propagation is] how the brain works.’ –Geoffrey Hinton (helped invent back-propagation in 1986), 2017
https://www.axios.com/artificial-intelligence-pioneer-says-we-need-to-start-over-1513305524-f619efbd-9db0-4947-a9b2-7a4c310a28fe.html

FOURTH: ‘We’re very far from having machines that can learn the most basic things about the world in the way humans and animals can do. Like, yes, in particular areas machines have superhuman performance, but in terms of general intelligence we’re not even close to a rat.’ –Yann LeCun, 2017
https://www.theverge.com/2017/10/26/16552056/a-intelligence-terminator-facebook-yann-lecun-interview

Computer scientist Judea Pearl is slightly more optimistic:
https://www.theatlantic.com/technology/archive/2018/05/machine-learning-is-stuck-on-asking-why/560675/

A fascinating short video showing how a computer-generated Paul Walker was inserted into Furious 7 after the actor died during filming. Within 20 years, I don’t think we’ll be able to tell apart human actors and CGI versions of them.
https://jalopnik.com/how-extensive-special-effects-helped-finish-furious-7-a-1825917978

Unreal Engine 4 – (2018) – Ridiculous Realistic Looking Characters!
https://youtu.be/Vh9msqaoJZw

Google’s “Duplex Assistant” can perfectly imitate humans during brief phone calls. I think machines will pass the Turing Test within 11 years, and shortly thereafter, we won’t be able to tell the difference between human speakers and CGI versions of them: we’ll be able to make machines that can speak using a real human being’s voice, to intelligently carry on conversations with other humans, and to even answer questions and put forth topics of conversation as the imitated human would.
https://youtu.be/ijwHj2HaOT0

Non-invasive, wearable sensors that monitor muscle and nerve activity can be used to accurately represent a person’s physical movements in a virtual reality avatar. The demo video is incredible.
https://youtu.be/5Z5aZK2C3ew

The world’s oldest spider is dead at 43. It was a trapdoor spider, and it survived that long by staying in one hole in the ground its whole life, conserving its energy and avoiding risks (good life advice?).
https://www.telegraph.co.uk/science/2018/04/27/farewell-no-16-scientists-left-miserable-worlds-oldest-spider/

Airborne lead particles that drifted to Greenland from Europe and got trapped in successive layers of ice tell the tale of Rome’s rise and fall. The quantity of lead smelting positively correlates with periods of prosperity.
https://www.usatoday.com/story/news/world/2018/05/14/roman-empire-rise-and-fall-revealed-greenland-ice/608819002/

The longest possible straight-line journeys over sea and land are uncovered, at long last! I wonder if the estimate would change if the Arctic Ice Cap were counted as dry land (explorers have walked across the whole thing before).
http://www.sciencemag.org/news/2018/04/ocean-path-will-take-you-longest-straight-line-journey-earth

Russia launched the world’s first floating nuclear reactor. It will be towed to the Arctic sea to provide power to a remote town.
https://www.npr.org/sections/thetwo-way/2018/04/30/607088530/russia-launches-floating-nuclear-power-plant-its-headed-to-the-arctic

Burying nuclear waste in shafts drilled into the seafloor might be the best permanent disposal option.
https://www.theatlantic.com/magazine/archive/1996/10/the-sub-seabed-solution/308434/

All of Ray Kurzweil’s predictions about when we’ll get all our energy from solar power

Ray Kurzweil in 2017

If you’re reading this blog, then you probably know who Ray Kurzweil is and what he thinks the future will be like. And if you don’t, then SHAME ON YOU! Kurzweil is one of the world’s greatest living futurists (though several of his predictions have failed), he’s influenced my own thinking, and if you know little or nothing about him, stop right now and go read his Wikipedia entry (https://en.wikipedia.org/wiki/Ray_Kurzweil).

Kurzweil’s perfusion and fame as a futurist have made him the subject of many “accuracy analyses” of predictions whose deadlines have come and gone. In spite of how crowded the field is,  I think there is a narrow area where I could be of use: tracking his predictions about the future of solar power.

On this topic, Kurzweil is quite bold: He thinks that solar power is growing exponentially, so it will supply 100% of the WORLD’S (not just America’s) ENERGY (not just ELECTRICITY) within 15 years. Additionally, his predictions are unambiguous in their wording and deadlines, rendering them highly amenable to objective evaluation. For better or worse, he won’t be able to talk his way out of this, as he has several times in the past through written rebuttals of unfavorable analyses.

The U.S. generates huge amounts of ENERGY, only a small fraction of which is ELECTRICITY, a lot of it gets wasted, and the remainder gets to end users.

I’m starting this blog entry to keep a running tally of all of Ray Kurzweil’s predictions regarding when the world will get 100% of its energy from solar power. The table below this will serve as a quick summary of the key data points in those predictions, while the written paragraphs below it will cite their exact wordings. Note that his deadline for 100% solar power has fluctuated over the last 13 years from 2025 to 2033, and I suspect it will continue to do so (Kurzweil will probably do something like bump it up by ~1 year every 2 years). His statements about the number of exponential “doublings” left until solar power supplies 100% of humanity’s energy also barely withstands arithmetic scrutiny (If solar power’s electricity output is doubling every two years, then why did he say it was 8 doublings away from 100% in 2011, but then say it was still 8 doublings away in 2013? Since two years had passed between the predictions, shouldn’t it have been down to 7 doublings in 2013?).

This blog entry will be updated as Kurzweil inevitably makes new predictions about this topic, so stay tuned!

Date of prediction# of "doublings" left until 100% solar energyYear when 100% of energy will be solar
2024/3/12?2034***
2016/4/19?2036**
2016/3/3062028
2014/6/105*2026 (low) - 2028 (high)*
2013/4/2382029 (low) - 2033 (high)
2011/2/16 82027 (low) or 2031 (high)
2010/3/16?2028
2008/4/13?2028
2008/2/19?2028
2005/12/23?2025
2005/10/25?2030

* Kurzweil’s June 10, 2014 prediction is based on the observation that, at that point in time, solar and wind together produced 4% of America’s energy.

**Kurzweil’s April 19, 2016 prediction pertained to “solar and other renewables” and his wording suggested the 100% milestone would be reached in less than 20 years.

***In his March 12, 2024 interview, Kurzweil first said the prediction pertained only to “solar,” but added a few minutes later that the energy mix would merely be 100% “renewable,” which included wind power.

March 12, 2024

“[Solar power technology is on] an exponential curve. And if you look at the curve, we’ll be getting 100% of all the energy we need in ten years.

…We’re gonna go to all renewable energy–wind and sun–within ten years.”

April 19, 2016 [republished on Kurzweil’s website on December 20, 2018]

What about our energy and food needs?

“Certainly within 20 years we’ll be meeting all our energy requirements through solar and other renewables. We’re awash in energy—10,000 times more than we need, from the sun—and we’re going to move to these renewables not just because we’re concerned about the impact on the environment but because it will be cheaper and more economic.”

https://www.playboy.com/read/playboy-interview-ray-kurzweil

http://www.kurzweilai.net/playboy-reinvent-yourself-the-playboy-interview

March 30, 2016

Turning his attention to solar, Kurzweil said four years ago Google founder Larry Page and he were asked by the National Academy of Engineering to study emerging energy technologies. The men selected solar due to its exponential growth. Kurzweil said solar has been around for over 25 years, and its market share has doubled every two years.

“In 2012, solar panels were producing 0.5% of the world’s energy supply. Some people dismissed it, saying, ‘It’s a nice thing to do, but at a half percent, it’s a fringe player. That’s not going to solve the problem,’” Kurzweil said. “They were ignoring the exponential growth just as they ignored the exponential growth of the Internet and genome project. Half a percent is only eight doublings away from 100%.

“Now it is four years later, [and solar] has doubled twice again. Now solar panels produce 2% of the world’s energy, right on schedule. People dismiss it, ‘2%. Nice, but a fringe player.’ That ignores the exponential growth, which means it is only six doublings or [12] years from 100%.”

https://www.solarpowerworldonline.com/2016/03/futurist-ray-kurzweil-predicts-solar-industry-dominance-12-years/

June 10, 2014

“We’re now…at 4% [of global energy needs being supplied by solar and wind power]. Maybe five doublings from 100% at two years each, that’s gonna be on the order of a decade from now. The use of energy is growing a little bit so maybe it’ll be 12 or 14 years.”

April 23, 2013

“We also see an exponential progression in the use of solar energy,” he has predicted. “It is doubling now every two years. Doubling every two years means multiplying by 1,000 in 20 years. At that rate we’ll meet 100% of our energy needs in 20 years.”

Since around one-third of that 104GW installed capacity is in Germany and China is only really getting going, Kurzweil’s forecasts don’t look too far-fetched.

Despite these glitches (or S curves) on his graph, Kurzweill still believes that a “doubling every two years means it’s only eight more doublings before it meets 100% of the world’s energy needs.”

That takes us to about 2027, close to his predictions in 2008.

https://www.pv-tech.org/editors-blog/could_kurzweil_be_right_about_solar_the_google_of_energy

February 16, 2011

“Today, solar is still more expensive than fossil fuels, and in most situations it still needs subsidies or special circumstances, but the costs are coming down rapidly — we are only a few years away from parity. And then it’s going to keep coming down, and people will be gravitating towards solar, even if they don’t care at all about the environment, because of the economics.

So right now it’s at half a percent of the world’s energy. People tend to dismiss technologies when they are half a percent of the solution. But doubling every two years means it’s only eight more doublings before it meets a hundred percent of the world’s energy needs. So that’s 16 years. We will increase our use of electricity during that period, so add another couple of doublings: In 20 years we’ll be meeting all of our energy needs with solar, based on this trend which has already been under way for 20 years.” [Kurzweil said.]

http://www.pbs.org/wnet/need-to-know/environment/futurist-ray-kurzweil-isnt-worried-about-climate-change/7389/

March 16, 2010

People may react similarly to his solar use forecast, he notes. However, since information technology is doubling every two years, our knowledge about and capability to utilize solar energy is “only eight doublings away from meeting 100% of our energy needs,” explains Kurzweil. Not only the U.S., but also countries like Germany, China, and Israel are actively pursuing solar energy systems.

http://www.electronicdesign.com/energy/kurzweil-speculates-solar-energy-health-and-other-topics

April 13, 2008

“Take energy. Today, 70 percent of it comes from fossil fuels, a 19th-century technology. But if we could capture just one ten-thousandth of the sunlight that falls on Earth, we could meet 100 percent of the world’s energy needs using this renewable and environmentally friendly source. We can’t do that now because solar panels rely on old technology, making them expensive, inefficient, heavy and hard to install. But a new generation of panels based on nanotechnology (which manipulates matter at the level of molecules) is starting to overcome these obstacles. The tipping point at which energy from solar panels will actually be less expensive than fossil fuels is only a few years away. The power we are generating from solar is doubling every two years; at that rate, it will be able to meet all our energy needs within 20 years.”

http://www.washingtonpost.com/wp-dyn/content/article/2008/04/11/AR2008041103326.html

February 19, 2008

“We also see an exponential progression in the use of solar energy,” [Kurzweil] said. “It is doubling now every two years. Doubling every two years means multiplying by 1,000 in 20 years. At that rate we’ll meet 100 percent of our energy needs in 20 years.”

https://www.livescience.com/4824-solar-power-rule-20-years-futurists.html

December 23, 2005

“To take energy, for example, I talk about how within 20 years we could have nanoengineered solar panels which would capture enough sunlight to meet all of our energy needs. If we captured 1 percent of 1 percent of the sunlight that falls on the Earth, we could meet all of our energy needs in a renewable fashion. Now we can’t do that today ’cause solar panels right now are an old industrial technology. But using new nanoengineered techniques, you’ll see actually significant progress in the next five years, but over 20 years we’ll actually be able to meet all of our needs with these kinds of renewable energy technologies and that store them in nanoengineered fuel cells.” [Kurzweil said.]

https://www.npr.org/templates/story/story.php?storyId=5067661

October 25, 2005

“This will mean that by the mid 2020s we will be able to meet our energy needs using very inexpensive nanotechnology-based solar panels that will capture the energy in 0.03 per cent of the sunlight that falls on the Earth, which is all we need to meet our projected energy needs in 2030.”

https://www.smh.com.au/technology/human-2-0-20051025-gdmb4u.html

Pre-2005

The predictions that Kurzweil’ made about solar power before 2005 are few, and don’t mention “doubling times” or give any future dates by which X% of global energy needs will be met with solar.