I've been wondering whether population is the right statistic to correlate greenhouse gas emissions with. Wouldn't it make more sense to compare it with a measu

I've been wondering whether population is the right statistic to correlate greenhouse gas emissions with. Wouldn't it make more sense to compare it with a measure of productivity? Producing 2% of the world's greenhouse gases is not bad at all if California performs 2+% of the world's greenhouse gas-producing activities.