Well, you're sulking rather than discussing, but I said I'd answer.
Obviously because each rich person does many times the environmental damage of each poor person. You can google yourself, but regarding carbon footprint:
Perhaps you're suppressing some guilt from treating your slaves badly? That is quite the odd comment above...
What a boring and single-tracked moral system and metric of goodness to reduce a person's worth down to the amount of carbon they emit. Such a pessimistic, lazy, and unproductive world view too. No wonder nobody wants to get aboard your climate death cult.
It's not a 'moral system and metric of goodness' my oversensitive virtual friend. It's a response to a problem (environment damage due to overpopulation) that's appropriate for the problem. If you're going to kill people off, it would be insane to kill those polluting negligible amounts.
Anyway, apologies for dragging out the discussion.
Why is it better for the rich to die? Do they have worse moral virtue?