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Human Impacts on Climate Name the primary gas which absorbs ultraviolet (UV) from the sun. 1. Ozone hole • Humans have added chlorofluorocarbons to atmosphere which destroy ozone and have created a hole over Antarctica and southern South America Why is the ozone layer important? It protects the Earth from UV which damages crops and causes cancer in humans. Ozone hole over Antarctica 2. Greenhouse Gas Emissions • Greenhouse gases are: • CO2, methane, water vapor • Infrared radiation or heat gets trapped by the addition of these gases (Greenhouse effect) What is it? Average global temperatures are warming What is the issue? 1. Glaciers are melting, sea levels are rising Tanzania 2. Increase in extreme weather events 3. Chemistry of Ocean water • Becoming more acidic • When warm waters persist, corals bleach and become less able to combat disease. As climate change continues, bleaching is predicted to become more common. 4. Ecosystems • Will be affected • extinction of species Monarch butterfly – soon to be on endangered species list 5. Increase of infectious disease • Malaria • Dengue fever • Tick borne diseases (Lyme) Warming is a natural process but humans are speeding up the process