A new study finds that climate change is already contributing to 400,000 deaths per year and costing the world more than $1.2 trillion, or 1.6 percent of global GDP. The report was commissioned by 20 governments and written by more than 50 scientists, economists and policy experts. In the report, the authors detail how the vast majority of deaths occur in developing countries and that the world’s poorest communities within lower and middle-income communities are most exposed to climate change risks.