At the World Economic Forum in Davos this year, two people stood out: Greta Thunberg, the 17-year-old Swedish climate activist, and Donald Trump, the US president. In their messages on climate change, these two could not have been more opposed: panic, confronted with indifference. But one thing they share is that they are not hypocrites: Ms Thunberg does not pretend we are doing anything relevant; Mr Trump does not pretend he cares. Most participants in the climate debate, however, pretend to care, pretend to act, or both. If anything is to be done, this must change.
Ours remains what it has been since the early 19th century: a fossil-fuel civilisation. There have been two energy revolutions in human history: the agricultural revolution, which exploited far more incident sunlight; and the industrial revolution, which exploited fossilised sunlight. Now we must return to incident sunlight — solar energy and wind — along with nuclear power, while maintaining our high standards of living.
The point of this latest energy revolution, however, is not to raise our standard of living directly, but to preserve the only home we know in the state to which life is now adapted. It is to avoid an irreversible experiment with the climate of our planet. So far, however, despite decades of talk, trends in emissions remain in the wrong direction.