One good result of the reaction to Covid-19 killing the global economy, at least as far as the Greens are concerned, is that the shutdown means markedly fewer emissions and that means climate doomsday will be postponed. Or will it?

Both concentrations of carbon dioxide in the atmosphere and total carbon emissions are tracked and that data published along with handy graphs, but claims of any link between changes in industry activity and changes in CO2 concentrations are hard to find.