The National Climate Assessment is prepared by our top scientists and is by far the largest, most comprehensive US-focused climate change report ever produced and gives in-depth look on climate change.
The findings point to humanity as the cause for this extreme weather pattern. Many independent lines of evidence demonstrate the world is warming and human activity is the primary cause.
Other changes flow from this warming, including melting of snow and ice, rising sea level, and increases in some types of extreme weather, such as extreme heat and heavy downpours.
How much climate change we will experience in the future depends largely on the global emissions pathway. Americans are already feeling the impact of climate change. Scientists from 13 federal agencies also found that recent decades have been the warmest of the past 1,500 years.
http://s3.amazonaws.com/nca2014/low/NCA3_Climate_Change_Impacts_in_the_…
http://nca2014.globalchange.gov/report#intro-section …
Climate change is real, and it's here. https://usat.ly/2zjeh4f
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