The Sierra Club is a non-governmental environmental organization in the United State. With more than 3.8 million members, the Sierra Club is a leading advocate for expanded environmental protections.
The Intergovernmental Panel on Climate Change (IPCC) is the United Nations body for assessing the science related to climate change. The IPCC is a key source of climate change data.
Its stated mission is to understand and predict changes in climate, weather, oceans and coasts; to share that knowledge and information with others; and to conserve and manage coastal and marine ecosystems and resources.