The man with the largest negative carbon footprint?

If you had to guess, which living person would you say has made the single biggest difference to reducing carbon emissions? There are some figures in politics or activism who might come to mind. Al Gore got a Nobel prize for his contribution, though we might want to argue about that. Perhaps we could consider Pope Francis or the action inspired by Greta Thunberg.

Then again, perhaps it isn’t a public figure. Perhaps it’s a diplomat who brokered a pioneering agreement like the Kigali Accord, ...