Climate change is an existential threat to all people. The challenges it poses are immediate and urgent. Evidence of ever-higher levels of climate risks are mounting, as global temperatures increase, sea levels rise and glaciers melt. More and more people worldwide are feeling the impacts of water scarcity, heat waves and wildfires, and, in some instances, catastrophic storms and floods. Vulnerable groups in developing countries, such as coastal communities, smallholder farmers and the urban poor, are particularly affected by rising temperatures and climate-related disasters.