Global atmospheric , climate, changes have occurred on earth since before our species walked the surface.
I think a relevant concern instead is the loss of farm land to development. Housing communities, expansionism of interstate and other arteries of travel, at the cost of farm land. Either through developers purchase or invocation of Eminent Domain.
No Farms No Food.
If America ever arrives at the point where we have to import food due to being unable to sustain the hundreds of millions that populate this country, we're a goner. If we think OPEC and oil rich nations have us literally over a barrel now, when they don't have to because of our own capacity to drill, imagine when other countries have to concede to survive us with food exports.
We're seeing domestic wheat farms diminished now because of the financial draw afforded by the Ethanol market.
A corn market that plants what is usually called , cow corn or pig corn, because it isn't typically used for human food markets.
Imagine, if we have to import the supply to meet the demand of food supplies in America. Because our open farm country is now replaced by townhouses, HA governed housing developments, and highways.