GLOBAL WARMING

objectives  To understand what is meant by global warming  To appreciate some effects of global warming  To consider what we can all do to help reduce carbon dioxide emmisions

Global warming  Global warming is primarily induced by human activities-burning of fossil fuels producing greenhouse gases  Atmospheric levels of greenhouse gases are at their highest values in 650,000 years

Over 85% of the world`s energy supply is carbon based  Coal-24%  Natural gas-24%  Crude oil and natural gas liquids-38%  Hydro, nuclear, geothermal,renewables-14%

Pre-industrial level of carbon dioxide=280ppm An increase of 500ppm is estimated to cause mean global Temperature to increase by 3 degrees centigrade plus/minus 1 degree C

Effects of global warming  Melting of ice caps-rising sea level  Melting glaciers  Changing currents  More extreme weather events

What can we do?  Renewable energy sources  Home insulation  Recycling  Use public transport  Plant more trees