What a husband usually does after a few years of his marriage.
He loses interest in his wife and develops more interests in others' wives.
The same rule applies to climate change with a little difference.
It affects those more which creates it less while affecting less those which create it a lot.
A wife cares more for her husband and gets lesser in return. A girlfriend cares less for her boyfriend and gets more in return.
It is a brutal injustice that those who are causing climate change are not its worst victims. While those that are not contributing much to it, are suffering most from its worst effects.
A less-developed country - like Pakistan - does not pollute the air as much as a developed country does.