"So those 'poor people' are soon going to be no longer poor, but contributing just as much per capita (perhaps more) as we are."
So maybe we should be leaders? There's zero reasons we need to "destroy our economy" to lower our footprint, or that other countries can't become greener while continuing to improve their quality of life and grow their economy other than that the will isn't there. The world has the means and tech.
Is it going to be cheap? Nope. Can we afford the alternative? Definitely not.