You two might agree if we consider that when you say "rich" you might describe the average individual on this website (if we consider all people alive).
I do believe that 90% of the people would not want to actually destroy the planet the way it seems to be happening, but I also believe that 90% of the people can't refrain themselves from bad health habits either. So, to fix the root cause I would discuss more about people's bad emotional/impulse control, otherwise we will just change one issue (climate) to any of the others (violence, unhappiness, etc.)