World Resources Institute: Earlier today, the Intergovernmental Panel on Climate Change (IPCC) released the Summary for Policymakers of Working Group Is (WGI) portion of the 5th assessment report (AR5) on climate change. The report, focused on the physical science of our climate system, confirms the overwhelming scientific consensus that the world is warming and human activities are responsible. Without immediate action to curb greenhouse gas emissions, communities, ecosystems, and critical infrastructure across the globe...