Agreed. But assuming no technology advances in this area for 30 years time seems implausible. What has happened with price/efficiency of solar, wind and grid-

Agreed. But assuming no technology advances in this area for 30 years time seems implausible. What has happened with price/efficiency of solar, wind and grid-scale batteries in the last 10 years provides a lesson. None of these were practical even 10 years ago and now they represent 90% of newly installed capacity globally (2020). And this is happening all-over whether with or without government support. For example, new-build, grid-scale battery storage is now cheaper on an LCOE basis than new build open-cycle ("peaker") natural gas plants. This has only happened recently - about a year ago. I was completely skeptical that this could happen a few years ago. I urge any/all hackernews readers to read more about _recent_ developments in de-carbonizing energy. It's fascinating and it has become clear to me that we're living through one of the great technology revolutions of human history. It genuinely is a Kodak/smartphone type moment with even bigger implications for human wellbeing. It's amazing that by being cheap enough, all the disadvantages of a new technology become less relevant. A bit like how the PC displaced "real computers" (i.e. mainframes) even though at the time they were little more than microcontrollers integrated with a terminal.