Climate change is happening now. The United States and the world are warming, global sea level is rising, and some types of extreme weather events are becoming more frequent and more severe. These changes have already resulted in a wide range of impacts across every region of the country and many sectors of the economy. Today, America needs reliable scientific information about current and future changes, impacts, and effective response options. The U.S. Global Change Research Program (USGCRP)—which released the 3rd National Climate Assessment in May 2014—is at the center of the Federal Government's efforts to fulfill this critical need. Scroll down to learn more.