Evidence for Climate Change • A large body of evidence from direct weather and climate observation, and from computer simulation, supports the hypothesis that human activity is one of the causal factors in the climate changes that are being currently observed. • No single study or observation is proof of climate change (natural or human- caused), but there is an international consensus of climate scientists on the anthropogenic climate change hypothesis.
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Evidence for Climate Change A large body of evidence from direct weather and climate observation, and from computer simulation, supports the hypothesis.
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Evidence for Climate Change
• A large body of evidence from direct weather and climate observation, and from computer simulation, supports the hypothesis that human activity is one of the causal factors in the climate changes that are being currently observed.
• No single study or observation is proof of climate change (natural or human-caused), but there is an international consensus of climate scientists on the anthropogenic climate change hypothesis.
Evidence for Climate change
1. Rising Temperatures2. Carbon dioxide (and other GHGs) level increases from direct
measurement and glacier ice cores
3. Melting Glaciers, Ice sheets and Sea ice4. Rising Sea Level5. Changes in Severe weather6. Changes in Precipitation Patterns7. Tree ring evidence (compared to known climate records)
Rising Temperatures
• Earth’s average temperature has generally increased from 1880-2006.
Melting Glaciers
• Over the last few decades, the average size of glaciers all over the world have decreased.
• Melting could cause serious water shortages.
Athabasca glacier, Alberta Canada
• Glacier Bay National Park
Why is Arctic sea ice important?
• Arctic sea ice keeps the polar regions cool and helps moderate global climate. Sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space.