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Climate change means longer colder winters and hotter summers. Thats why they changed the name from Global Warming to climate change because it certainly does not warm the earth's temperatures year round. Sounds like a good thing for both skiing and summer vacation to me. The reason why its a problem is because of the landmass we will lose by the massive swamps that changing ocean levels will cause, basically uninhabitable because of the annual flooding.
The proof lies in paleoecological proxy data, gathered from many different sources, including core samples from trees, glaciers, and lake bed sediments. These sources can provide reliable climate data going back nearly 100,000 years. Standard Milankovic parameters do not account for the current aberrations (eccentricity, precession, albedo, etc.). However, there is a strong positive correlation between post industrial revolution carbon emissions and the current rate of climate change. This is not to say that the Earth's history hasn't been characterized by many different climate cyles, but the data we have shows that the rate of the current climate change is unprecedented, and again, also coincides with post-industrial rev. carbon emissions. Or, look at it this way:
Fact A: Carbon Dioxide is a green house gas; increased atmospheric concentrations lead to a decrease in how much heat from insolation can escape through our atmosphere.
Fact B: Carbon, which is a relatively rare element, is being dug up, pumped out, and burned at historically unprecedented rates...all of this ends up in our atmosphere as carbon dioxide.
A + B = ???
Perhaps the answer to A + B is our current climate change, perhaps we are experiencing this on top of some other non-anthropocentric cause furthering climate change, but at the very least the future of this planet is not ours to gamble with. It is only our job to do whatever we can while we are here.