If the rich countries were able to send individual cash payments to people in poor countries, bypassing possibly corrupt governments, would you let rich countries pay people in poor countries to take their high-polluting factories?
If so, how high would the annual payment have to be per family? If not, why not?
You would probably sacrifice yourself to save all of humanity, but you probably wouldn't sacrifice yourself to save the life of one random stranger. What number is your cutoff: How many lives would you have to save for you to voluntarily face sure death?