The main danger of climate change is global warming due to human-made gases, mainly CO2. Global emissions are accelerating because of constant efforts to massively expand fossil fuel extraction, by oil drilling to increasing ocean depths, into the Arctic, and onto environmentally fragile public lands; squeezing of oil from tar sands and tar shale; hydrofracking to expand extraction of natural gas; and increased mining of coal via mechanized longwall mining and mountain-top removal.
This could result in irreversible changes such as ice sheet disintegration causing a a continually adjusting shoreline, extermination of a substantial fraction of species on the planet, and increasingly devastating regional climate extremes.
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