![]() The World Health Organization (WHO) calls climate change the greatest threat to global health in the 21st century. ![]() Human migration and conflict can also be a result. Ĭlimate change threatens people with food and water scarcity, increased flooding, extreme heat, more disease, and economic loss. These include ocean heating, ocean acidification and sea level rise. Even if efforts to minimise future warming are successful, some effects will continue for centuries. Rapid environmental change in mountains, coral reefs, and the Arctic is forcing many species to relocate or become extinct. Higher temperatures are also causing more intense storms, droughts, and other weather extremes. Increased warming in the Arctic has contributed to melting permafrost, glacial retreat and sea ice loss. Larger amounts of these gases trap more heat in Earth's lower atmosphere, causing global warming.ĭue to climate change, deserts are expanding, while heat waves and wildfires are becoming more common. Greenhouse gases absorb some of the heat that the Earth radiates after it warms from sunlight. Fossil fuel use, deforestation, and some agricultural and industrial practices increase greenhouse gases, notably carbon dioxide and methane. The current rise in global average temperature is more rapid than previous changes, and is primarily caused by humans burning fossil fuels. ![]() Climate change in a broader sense also includes previous long-term changes to Earth's climate. In common usage, climate change describes global warming-the ongoing increase in global average temperature-and its effects on Earth's climate system. Human activity has caused increased temperatures, with natural forces adding some variability. Change in average surface air temperature since the Industrial Revolution, plus drivers for that change.
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