The Paris Climate Agreement is a global effort to keep the rise of average global temperature under 2 degrees celsius above pre-industrial levels. Pulling out of this agreement could lead to the emission of 3 billion more tons of carbon dioxide a year, which would melt arctic ice faster, acidify the ocean faster, resulting in a huge loss of biodiversity in the ocean and on land. Pulling out of the agreement could cause the US alone to raise the global temperature by up to 0.5 degrees Celsius by the end of the century.