Talk of carbon tariffs is getting serious. But so are complaints that they would be unfair, risky, and marginally effective.
Watching the prices of natural gas in Europe, and gasoline in the US, soar as the Ukraine conflict strangles supplies, you might think that energy self-sufficiency is the ultimate goal for any country. But trying to go it alone comes with its own risks.
Is solar geoengineering inevitable or can we still fix the climate without it?