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U.S. EPA report: "Climate Change Indicators in the United States"
Climate Change Indicators in the United States, 2016 (4th ed.)
'The Earth's climate is changing. Temperatures are rising, snow and rainfall patterns are shifting, and more extreme climate events - like heavy rainstorms and record high temperatures - are already happening. Many of these observed changes are linked to the rising levels of carbon dioxide and other greenhouse gases in our atmosphere, caused by human activities. EPA partners with more than 40 data contributors from various government agencies, academic institutions, and other organizations to compile a key set of indicators related to the causes and effects of climate change.'