As greenhouse gas concentrations rise, higher temperatures increase heat-related illnesses and make working outdoors more difficult. Forest fires ignite more easily and spread more quickly when conditions are hotter.
Climate change poses risks to the survival of species on land and in the oceans, and these risks increase as temperatures rise, as the loss of species due to climate change increases, as the world is losing species at a rate 1,000 times greater than ever before.
 Climate change is the biggest health threat facing humanity. Climate impacts are already harming health, through air pollution, disease, extreme weather events, forced displacement, and increased hunger and malnutrition in places where people cannot grow crops or find enough food.