The Fourth National Climate Assessment (NCA4) fulfills a US congressional mandate to report on climate change in the United States every four years, and contains two volumes. This report, Volume II, draws on the foundational science described in Volume I, the Climate Science Special Report (CSSR), which was published in 2017.

A new U.S. government report shows that climate is changing and that human activities will lead to many more changes. These changes will affect sea levels, drought frequency, severe precipitation, and more. The Climate Science Special Report (CSSR), created by a U.S.

The average temperature in the United States has risen rapidly and drastically since 1980, and recent decades have been the warmest of the past 1,500 years, according to a sweeping federal climate change report awaiting approval by the Trump administration.

This new report published by U.S. Global Change Research Program assesses the science of climate change and its impacts across the United States, now and throughout this century. It says that climate change is already having significant financial, ecological and human health impacts across the US.

Plant and animal species are shifting their geographic ranges and the timing of their life events – such as flowering, laying eggs or migrating – at faster rates than researchers documented just a few years ago, according to a technical report on biodiversity and ecosystems used as scientific input for the 2013 Third National Climate Assessment.