Human influence on warming the atmosphere, ocean, and land is an unequivocal fact. Each of the last four decades has been successively warmer than any decade that preceded it since 1850 as greenhouse gas (GHG) have continued to concentrate
in the atmosphere. In 2019, atmospheric CO2 concentrations were higher than at any time in at least 2 million years.
The Intergovernmental Panel on Climate Change (IPCC) is the world’s leading source assessing the science of climate change. Thousands of people from all over the world contribute to the work of the IPCC. 234 scientists from 66 countries volunteer their time to assess thousands of scientific papers published each year to provide a comprehensive summary of what is known about the drivers of climate change, its impacts and future risks, and how adaptation and mitigation can reduce those risks.
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