Tim Foresman is a leading authority on reading the vital signs of our warming planet. As Co-Principal Investigator for the National Science Foundation's Long-Term Ecosystem Monitoring Program in the mid-1990s, he detailed the scientific evidence for climate change. At NASA Headquarters, he worked to create accurate projections of the local and regional impacts of global warming. He was tapped by the United Nations Environment Programme to serve as its Director of Early Warning and Assessment and Executive Science Advisor.