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The dominant cause of the warming since the 1950s is human activities. This scientific finding is based on a large and persuasive body of research. The observed warming will be irreversible for many years into the future, and even larger temperature increases will occur as greenhouse gases continue to accumulate in the atmosphere.
The Intergovernmental Panel on Climate Change (IPCC) has organized many of the risks of climate change into five "reasons for concern." [1] [2] The reasons for concern show that these risks increase with increases in the Earth's global mean temperature (i.e., global warming).
A 15-nation poll conducted in 2006, by Pew Global found that there "is a substantial gap in concern over global warming—roughly two-thirds of Japanese (66%) and Indians (65%) say they personally worry a great deal about global warming. Roughly half of the populations of Spain (51%) and France (46%) also express great concern over global ...
While aerosols typically limit global warming by reflecting sunlight, black carbon in soot that falls on snow or ice can contribute to global warming. Not only does this increase the absorption of sunlight, it also increases melting and sea-level rise. [58] Limiting new black carbon deposits in the Arctic could reduce global warming by 0.2 °C ...
The controversies are, by now, mostly political rather than scientific: there is a scientific consensus that global warming is happening and is caused by human activity. [2] Public debates that also reflect scientific debate include estimates of how responsive the climate system might be to any given level of greenhouse gases (climate sensitivity).
More people will be exposed to the ravages of flooding and drought. But if the nations involved in the Paris talks stay on their current emissions track and don’t reduce greenhouse gas emissions, temperatures could go up by almost 6 degrees Celsius this century, according to the Committee on Climate Change, an independent body that advises ...