Global warming and ozone depletion are caused by human activities that release greenhouse gases and CFCs into the atmosphere. This has led to rising global temperatures, melting ice caps, more extreme weather, and a growing ozone hole. Consequences include severe droughts, flooding, impacts on plants/animals/people from increased UV radiation and rising sea levels. International agreements aim to reduce emissions through measures like the Montreal Protocol and Kyoto Protocol, while countries also promote renewable energy and energy efficiency.

1. CHAPTER 10 Global Warming and Ozone Depletion

4. Lead-in: Extreme Weather Extension activity: Killer Hurricanes Year 2005 was dubbed by scientists around the world as the Year of the Hurricane. Never before had the Atlantic Ocean experienced 27 tropical storms in a year, of which seven made landfall in the USA. Storms are also getting more powerful and occurring more frequently. What could be the cause for the increase in tropical storms? How did they affect people and the environment? Hurricane Katrina (Aug 28 2005) Massive destruction caused by Hurricane Katrina

8. Causes of global warming Sources of carbon dioxide : Burning fossil fuels in cars, factories and power plants Sources of CFCs : Aerosol cans, air-conditioners, refrigerators, plastic forms Sources of methane : Landfills, rice paddies, guts of cattle Sources of nitrous oxides : Vehicle exhaust pipes, fertilisers, livestock wastes Increase in greenhouse gas emissions due to human activities