Directly in real time none. However long term the health effects of pollution increase health care costs, in some cases such as the large lead doses many inner city children got caused a decreased IQ and damaged motor skills in those most heavily dosed with obvious negative impacts to the nation. Drinking water may be threatened causing major costs. Natural resources may be exhausted causing the nation to import resources it once exported.

As for the Gorebot nonesense in terms of "Climate change". The science is more voodoo hysteria which discredits both the environmental movement and climate change research. It has however caused a rash of ill concieved repressive measures against the poor in the US and targeted industries. This comes at a time and is a part of the economic crisis and also part of the political manuvers. Much of it is pure hype. For example the top sources of man made methane are rice farming and artifical fertilizer used primarily on lawns. To enact controls on the major sources of Methane would be to hit Asian nations extremely hard if actually followed and could cause people to starve to death. Nor are the affluent Gorebots going to switch to manure fertilizers to reduce their greenhouse gas emissions. Instead they blame the insignificant methane output of livestock. The impact is that nations with flourishing livestock industries are under assault while not actually having any benefit at all.

In terms of population, a damaged ecology will be more suceptible to famine, disease and will see lowered life expectancies. However human inginuety will often overcome such ecological barriers.