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Global Warming

Global Warming. Current Climate Change. Scientists believe that Earth’s climate is changing again but this time because of human activity. Rising Temperatures. Average temperatures go up and down over the years but the general trend is INCREASING

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Global Warming

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  1. Global Warming Current Climate Change

  2. Scientists believe that Earth’s climate is changing again but this time because of human activity

  3. Rising Temperatures • Average temperatures go up and down over the years but the general trend is INCREASING • By 2006, 11 of the past 12 years were the warmest on record

  4. In Canada, the average national temperatures have increased by 1oC in the last 55 yrs, they have risen 2.5oC in the Yukon

  5. Melting Glaciers • Over the last few decades the average size of glaciers all over the world has begun to decrease as the temperature has increased • People around the world depend on glaciers for their water – melting glaciers could lead to water shortages

  6. Ice Sheets • Ice sheets in Greenland are melting twice as fast as they did 15 yrs ago • Snow is melting much further inland and at higher altitudes than ever before Sea Ice • Summer ice continues to decrease

  7. Rising Sea Levels • Global sea levels have risen significantly over the past 130 yrs • Since 1993, sea levels has risen almost twice as fast than the 30 yrs before • Can result in flooding of coastal areas • Thermal Expansion: Warm water expands which also raises sea levels

  8. Changes in Severe Weather • Certain extreme weather events such as heat waves and hurricanes have become more severe i.e. Hurricane Katrina (2005) & Hurricane Sandy (2012)

  9. Changes in Precipitation • In the Northern hemisphere there is more precipitation as rain than as snow • There has been an increase in heavy precipitation • Other areas have received less precipitation than they used to and are experiencing periods of drought

  10. Changing Seasons • Amount of snow that stays on the ground in winter is decreasing • Amount of very cold days throughout the world have decreased • Cold weather is starting later in the fall and ending earlier in the spring  longer growing seasons

  11. Changes in Ecosystems • Trees, shrubs and flowers are flowering sooner due to temperature changes

  12. Animals are breeding earlier

  13. Animal and plants are slowly migrating towards the poles and to higher altitudes as their regions warm up  insects are also moving with them

  14. Human Impact • Humans are making MORE greenhouses gases! • CO2 – burning fossil fuels for transportation and factories; deforestation means less trees to absorb CO2

  15. Methane – land fills – decomposing garbage, cows (for food) • Nitrous Oxide – using fertilizers, animal waste

  16. What can be done? • Reduce use of fossil fuels – carpool, walk, ride • Use hybrid or electric cars/buses • Improved fuel efficiency • Laws to reduce CO2 • Eat less meat

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