Also, the US has emitted much more of the total historical output (though I don't know how much of that affects us today) and is vastly more wealthy. If you're

Also, the US has emitted much more of the total historical output (though I don't know how much of that affects us today) and is vastly more wealthy. If you're the wealthiest person in town, you can't ask the people in the poor neighborhood to make extra sacrifices. The US has a very serious responsibility.