In December 2009, EPA ruled that climate change caused by emissions of greenhouse gases threatens the public's health and the environment. Since that time, EPA has received ten petitions challenging their determination.
PostedJun 3, 2009
Ecosystems & Biodiversity
The report provides an overview of what is known about ecological thresholds and where they are likely to occur. It also identifies those areas where research is most needed to improve knowledge and understand the uncertainties regarding them.