The draft U.S. National Climate Assessment was released last week, confirming that the climate is changing, that it is primarily due to human activities, and that the United States is already being adversely impacted. These top-line messages should come as no surprise, as they reconfirm the major findings of previous National Climate Assessments and of the Intergovernmental Panel on Climate Change’s recent reports.
But the 1,000-plus pages of the Assessment also carry important findings—many of which have not been highlighted in media reports thus far. WRI’s experts reviewed the assessment in its entirety. Below, we boil down some of the highlights from this comprehensive body of work, including its findings on how increases in greenhouse gas emissions have impacted temperature, sea level rise, precipitation, ice cover, ecosystems, and human health in the United States and globally.
Build-up of greenhouse gases in the atmosphere has already caused America’s average temperature to rise by 1.5 ˚F since 1895, according to the assessment. With continued increases in emissions, U.S. temperatures are projected to increase 5-10˚F by the end of the century. Rising temperatures have implications for human health, drought, storm intensity, and species and ecosystem health, among others. A few other notable statistics include: