Arctic ice has also become thinner, which makes it more vulnerable to further melting. Warmer temperatures and later fall frosts allow ragweed plants to produce pollen later into the year, potentially prolonging the allergy season for millions of people. For example, American lobster, red hake, and black sea bass in the Northeast have moved northward by an average of 119 miles. Scientists are highly confident that many of the observed changes can be linked to the rising levels of carbon dioxide and other greenhouse gases in our atmosphere, which are caused by human activities. People aged 65+ accounted for more heat-related hospitalizations than any other age group, and males were hospitalized for heat-related illnesses more than twice as often as females. Antarctic sea ice extent in September and February has increased somewhat over time. However, the most recent levels are all within the range of historical variation. Data sources: CSIRO, 2016; MRI/JMA, 2016; NOAA, 2016. The observed changes reflect earlier spring warming as well as later arrival of fall frosts. Across all sites, snowpack depth declined by an average of 23 percent over the last 50 years. Observations of lilacs and honeysuckles in the contiguous 48 states suggest that first leaf dates and bloom dates show a great deal of year-to-year variability. Data source: National Audubon Society, 2014. One important way to track and communicate the causes and effects of climate change is through the use of indicators. searchable inventory offers freely available models, tools, and databases. Since 1983, the United States has had an average of 72,000 recorded wildfires per year. EPA's Global Change Explorer is a collection of web tools that allow visualization, comparison, and access to spatial data that describe potential future environmental change. “This goes beyond marketing and beyond politics,” Matthew Shudtz, executive director of the Center for Progressive Reform, tells TIME. Lakes in the northern United States are freezing later and thawing earlier compared with the 1800s and early 1900s. The Earth's climate is changing. Over the last 75 years, minimum, maximum, and average flows have changed in many parts of the country—some higher, some lower. Environmental Topics; Laws & Regulations; Menu From 1960 through 2014, water temperature increased at 79 percent of the stream sites measured in the region. Lyme disease is a bacterial illness spread by ticks that bite humans. EPA Raises Barriers to Climate-Change Rules The rule sets new criteria for what is considered a significant contributor of greenhouse-gas emissions The … Stream temperatures have risen throughout the Chesapeake Bay region. This interference is resulting in increased air and ocean temperatures, drought, melting ice and snow, rising sea levels, increased rainfall, flooding and other influences. United States Environmental Protection Agency, Atmospheric Concentrations of Greenhouse Gases. The incidence of West Nile virus neuroinvasive disease in the United States has varied widely from year to year and among geographic regions since tracking began in 2002. EPA’s Climate Change in the United States: Benefits of Global Action states that without action on climate change, dramatic loss of shallow coral cover is predicted to occur. The 1930s and 1950s saw the most widespread droughts, while the last 50 years have generally been wetter than average. As the U.S. climate has warmed in recent years, heating degree days have decreased and cooling degree days have increased overall, suggesting that Americans need to use less energy for heating and more energy for air conditioning. West Nile virus is spread by mosquitoes, whose habitat and populations are influenced by temperature and water availability, among other factors. Changes in temperature, precipitation, snowpack, and glaciers can affect the rate of streamflow and the timing of peak flow. 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