Indeed, virtually every credible source of scientific research from around the world indicates that human causes, primarily the burning of fossil fuels and the subsequent increase in atmospheric CO2 levels, are responsible for global warming. Some of these organizations are the American Medical Association, Intergovernmental Panel on Climate Change, American Association for the Advancement of Science, Ecological Society of Australia, American Chemical Society, Geological Society of London, American Geophysical Union, International Arctic Science Committee, American Meteorological Society, American Physical Society, and The Geological Society of America. Over 197 international organizations agree on this point.
Thawing permafrost alters local ecosystems, destabilizes infrastructure and releases heat-trapping gases into the atmosphere, which spurs more climate change. Read how increasing ground temperatures worsen global warming .
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Individual, regional, and national actions can all add up to global solutions, slowing and eventually halting the upward climb of CO2 concentrations in the atmosphere.
Scientists have modeled the Earth’s temperature with both natural and human drivers of climate change and the results show that greenhouse gas emissions are causing the Earth to warm up three times as fast now than in 1950 9 , 10 .
In order to understand the effects of all the gases together, scientists tend to talk about all greenhouse gases in terms of the equivalent amount of CO 2 . Since 1990, yearly emissions have gone up by about 6 billion metric tons of "carbon dioxide equivalent" worldwide, more than a 20 percent increase.