1. Introduction Climate change is now the greatest environmental problem confronting the earth ecosystem and human beings. It is largely caused by unrestricted greenhouse gas emissions all over the world from industry and many human activities. It can be prevented from becoming worse if some decisive measures and actions are in place (Total Environment Centre, 2012). As one of the world environmental advocacy bodies, the United States Environmental Protection Agency (EPA) dedicates to protect human health and the environment. The advocay body is established for the purpose of reducing environmental risks to Americans, making efforts to incorporate U.S. policies in environment into actions on the basis of the most reliable scientific information (EPA, 2012). To systematically address the impact of climate change, the adaptation needs through managing climate threat, and the exact decision-making actions, science plays an important role (Laguna, 2012). For the advocacy organisations, science can also support their values and interests. In this case, an investigation into the use of science by the EPA concerning climate change is to be done in this report.
2. EPA’s advocacy positions
2.1 EPA’s contribution to debate on climate change About debate on climate change, EPA released news to support the government policies and at the same time advocate its positions. For instance, a carbon footprint reduction program named “Carbon yeti” successfully increased people’s awareness of climate change. This received EPA’s supports and achieved an EPA Clean Air Excellence Award (Kaufman, 2011). In addition, EPA released a report called EPA Endangerment Finding which was made after a review of bountiful public comments and research results on climate change. The findings indicated that greenhouse gas from human activity is the main cause of