The question of where people can make the biggest impact is very individual. In other words, the 80/20 is different for all of us. Depends where you live, what your current habits are etc.
Where I live, coal-fired electricity generation is the single biggest contributor to per capita emissions, not agriculture. Where you live, it is probably different.
That said, I think 80/20 is not enough in this case.
Are we only prepared to put in a 20% effort on global warming?
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