EPA Reports on Climate

Two reports from Environmental Protection Agency focus on six greenhouse gases that pose a potential threat and on the impact of climate changes on regional air quality.

Air pollution in action.

Air pollution in action.

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Washington, D.C. –After a thorough scientific review ordered in 2007 by the U.S. Supreme Court, the Environmental Protection Agency recently issued a proposed finding that greenhouse gases contribute to air pollution that may endanger public health or welfare.

The agency also released a report on the potential impacts of climate change on regional U.S. air quality. The information contained in the report will enhance the United States’ ability as a nation to protect air quality and human health.

The proposed finding on greenhouse gases, which now moves to a public comment period, identified six such gases that pose a potential threat.

 “This finding confirms that greenhouse gas pollution is a serious problem now and for future generations. Fortunately, it follows President Obama’s call for a low carbon economy and strong leadership in Congress on clean energy and climate legislation,” EPA Administrator Lisa P. Jackson says. “This pollution problem has a solution – one that will create millions of green jobs and end our country’s dependence on foreign oil.”

As the proposed endangerment finding states, “In both magnitude and probability, climate change is an enormous problem. The greenhouse gases that are responsible for it endanger public health and welfare within the meaning of the Clean Air Act.”

EPA’s proposed endangerment finding is based on rigorous, peer-reviewed scientific analysis of six gases – carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons and sulfur hexafluoride – that have been the subject of intensive analysis by scientists around the world. The science clearly shows that concentrations of these gases are at unprecedented levels as a result of human emissions, and these high levels are very likely the cause of the increase in average temperatures and other changes in our climate.

The scientific analysis also confirms that climate change impacts human health in several ways. Findings from a recent EPA study titled “Assessment of the Impacts of Global Change on Regional U.S. Air Quality: A Synthesis of Climate Change Impacts on Ground-Level Ozone,” for example, suggest that climate change may lead to higher concentrations of ground-level ozone, a harmful pollutant. Additional impacts of climate change include, but are not limited to: increased drought; more heavy downpours and flooding; more frequent and intense heat waves and wildfires; greater sea level rise; more intense storms; and harm to water resources, agriculture, wildlife and ecosystems.

The report concludes that there is a potential for climate change to make ozone pollution worse in some regions and that future ozone management decisions may need to account for the possible impacts of climate change.

Climate change has the potential to produce increases in ground-level ozone in many regions. Ground-level ozone is formed in the presence of sunlight by a chemical reaction between oxides of nitrogen (NOx) and volatile organic compounds (VOCs), which are emitted from sources like motor vehicles and industrial facilities. Climate change also could increase the number of days with weather conditions conducive to forming ozone, potentially causing air quality alerts earlier in the spring and later in the fall.

The Global Change Research Program in EPA’s Office of Research and Development led the development of the peer-reviewed report, which was done in partnership with EPA’s Office of Air and Radiation. The report combines the results of new EPA-funded and existing scientific research and acknowledges that uncertainty remains over the specific regional patterns of climate change induced ground-level ozone changes.

In proposing the finding on greenhouse gases, Jackson also took into account the disproportionate impact climate change has on the health of certain segments of the population, such as the poor, the young, the elderly, those already in poor health, the disabled, those living alone and/or indigenous populations dependent on one or a few resources.

In addition to threatening human health, the analysis finds that climate change also has serious national security implications. Consistent with this proposed finding, in 2007, 11 retired U.S. generals and admirals signed a report from the Center for a New American Security stating that climate change “presents significant national security challenges for the United States.” Escalating violence in destabilized regions can be incited and fomented by an increasing scarcity of resources – including water. This lack of resources, driven by climate change patterns, then drives massive migration to more stabilized regions of the world.

The proposed endangerment finding now enters the public comment period, which is the next step in the deliberative process EPA must undertake before issuing final findings. The proposed finding does not include any proposed regulations. Before taking any steps to reduce greenhouse gases under the Clean Air Act, EPA would conduct an appropriate process and consider stakeholder input. Notwithstanding this required regulatory process, both President Obama and Jackson have repeatedly indicated their preference for comprehensive legislation to address this issue and create the framework for a clean energy economy.

For more information, visit the EPA web pages for greenhouse gases and climate change. Or more information on EPA Office of Research and Development’s Global Change Research Program can be found at the website.