Important:
It will not affect the american ecosystem in one single way. There are many stuff that will change due to global warming, not only in America.
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Here's some information:
- Global warming can raise sea levels by melting glaciers - that can affect North-America since it stands relatively close to the North Pole.
- Living organisms have adapted to live under certain conditions, and if those conditions change too rapidly, we'll see many things going on. Plants can start dying-out, which means all the other animals will die-out as well.
- An increase in water temperature might affect the water cycle, since more water will evaporate in the surface, and we don't know if the condensation of water will be able to keep up.
- Dry and hot regions will get even drier and hotter, and that's not something we want in the hot and dry southern regions of North-America.
- Ice/snow is important in the ecosystems that have it. It forms part of a cycle that can cause a lot of trouble if broken.
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Now, if we apply all those consequences and many others to the whole world, the only conclusion with can get to is that every day that passes and we don't do anything, is a day less until our extinction. If things aren't done seriously, Mars is not a salvation option, nor is the Moon or any other place we've been exploring.
Hope it helped,
BioTeacher101