Do you know how climate change affects Bangladesh? People in the coastal area lose their homes and livelihoods. These people are generally farmers, living off the land, providing food for rest of the country, but not adding that much to the “GDP” otherwise.
Do you know how GDP growth happens in Bangladesh? We open more sweatshops for H&M and fast fashion, providing labor for cheap so people can look fancy. These are largely in the urban area, with workers mostly living in slums, and working 12 hour days 6 days a week.
So your “rational” solution is to let some people lose their homes and livelihood so they have no choice but to become refugees in their own country so that in America there is an abundant supply of twice-worn T shirts? Because that’s how you maximize GDP while increasing inequality and totally destroying the stability and peace within the country.
Hope you can think a bit more “rationally” with the added context, but maximizing the sum of any utility value has never been an ultimately good thing, including GDP/GDP growth.