![]() The changes will include more frequent downpours, floods, droughts, and heat waves. However, if warming continues, climate models project that wet areas will continue to get wetter while dry areas will get drier. For example, significant droughts in the 1930s and 1950s dropped the average precipitation for the earlier period, making recent years seem much wetter in comparison. While there is an increase, it is harder to attribute the change to human activity, since rain and snowfall totals vary widely from year to year. This map shows how much precipitation changed between 19 compared to the average precipitation observed between 19. On average, precipitation has increased since 1900, but some areas have gotten drier. Scientists also observed changes in precipitation. “Multiple lines of independent evidence confirm that human activities are the primary cause of the global warming of the past 50 years,” says the report. Bold lines divide the country into regions, and the change is uneven across the regions. The map above shows temperature changes between 19 compared to the average temperature between 19. The warmest year on record for the United States was 2012. Since consistent record-keeping began in 1895, the average temperature in the United States has increased by 1.3 to 1.9 degrees Fahrenheit (0.8 to 1.1° Celsius), and most of that change has happened since 1970. It contains 12 key findings, the first of which notes that climate is changing globally and that change is apparent in the United States.Īmong the changes is an increase in temperature, as illustrated in the above image. ![]() The Global Change Research Act of 1990 requires that Congress and the President should be presented every four years with an assessment of the effects of climate change on the United States, so a team of more than 300 experts assembled the report from peer-reviewed science and observations. Global Change Research Program on May 6, 2014. ![]() “Climate change is already affecting the American people in far-reaching ways.” So begins an extensive report issued by the U.S. ![]()
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