The
Clean Air Act (CAA) is the comprehensive federal law that regulates air
emissions from stationary and mobile sources.
Established in 1970, the CAA aims to clean and protect air in the United
States. The law authorizes the EPA to
establish National Ambient Air Quality Standards (NAAQS) to protect public
health and public welfare and to regulate emissions of hazardous air pollutants. If an air pollution is determined to be
harmful to the health and welfare of current and future generations, it becomes
an issue for the CAA.
This
is the case with carbon dioxide and greenhouse gas emissions. In 2009 the EPA found that these emissions
are harmful as they cause climate change and ocean acidification. These gases trap heat in the atmosphere and include
carbon dioxide, methane, nitrous oxide, fluorinated gases and are produced by
human activities. Scientists warn that
climate change can lead to more intense weather events causing deaths, and
damage to property and infrastructure, among many other problems. In the past few years, under the CAA, the EPA
has been taking steps to limit greenhouse gas pollution.
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| Growth Areas and Emissions since the inception of the Clean Air Act in 1970 |
Between
2010 and 2012, the EPA and the National Highway and Traffic Safety
Administration issued national greenhouse gas emission standards and fuel
economy standards for cars and trucks for model years 2012-2025. These standards are estimated to save 4
billion barrels of oil and reduce greenhouse gas emissions by 2 billion metric
tons over the lifetimes of light duty vehicles produced in 2017-2025. In 2011, the EPA and states began requiring
preconstruction permits that limit greenhouse gas emissions from large new
stationary sources. As Kelsey has written
about, in August of 2015, President Obama and the EPA announced the Clean Power
Plan, which is a partnership created by the CAA. In July of 2015, the EPA finalized a rule that
prohibits certain uses of hydrofluorocarbons (HFCs), a class of potent
greenhouse gases. These HFCs can be
found in air-conditioning, refrigeration and other equipment. With new technologies for this equipment and
with the new rule, HFC emissions are estimated to reduce greenhouse gas
emissions of 54 to 64 million metric tons of carbon dioxide equivalent in 2025.
Along
with the reduction of greenhouse gases, the EPA is also working on protecting
the ozone layer. Under the Clean Air Act
there are programs to ensure refrigerants and fire extinguishing agents are
recycled properly, ensure that alternatives to ozone-depleting substances are
evaluated for their impacts on human health and the environment, and ban the
release of ozone-depleting substances during work on air conditioners and other
refrigeration equipment. The EPA also
plans to phase-out ozone-depleting substances and continue to minimize the release
of chemicals in use.
The
EPA encourages the development of products, technologies, and initiatives that
reap co-benefits in climate change. All
of these regulations being taken by the EPA and other actors under the CAA are
a good steps towards mitigating the problem of climate change in the United
States. It also encourages other nations
to adopt similar strategies to reduce emissions to solve climate change.
Sources
http://yosemite.epa.gov/opa/admpress.nsf/0/B1C42A422851C64685257E760057D08F