Lecture4...1

Lecture4...1 - Global Climate Change CO2 Emissions The...

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The Greenhouse effect is beneficial: but there is also too much of a good thing! The concern over increasing "greenhouse gases" such as carbon dioxide due to burning of fossil fuels (oil, coal, wood). Global Climate Change: CO 2 Emissions Primary Greenhouse Gases: carbon dioxide, water vapor, methane, ozone, nitrous oxide Earth’s mean surface temperature has increased 0.5 ° C since the 19 th century.
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The Greenhouse effect is beneficial: but there is also too much of a good thing! The concern over increasing "greenhouse gases" such as carbon dioxide due to burning of fossil fuels (oil, coal, wood). In the last 40 years measurements from Mauna Loa (Hawaii) show a 17% increase in CO 2 . Before the Industrial Revolution, CO 2 levels were ~ 274 ppm (parts per million). In 1958, the mean CO 2 levels at Mauna Loa were 316 ppm. Today, the mean CO 2 levels are ~380 ppm. Global Climate Change: CO 2 Emissions
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Global Climate Change: CO 2 Emissions Are the predicted changes for global warming larger or more rapid than past changes? How reliable are the predictions? Past climates can be studied using pollen records in cores from lake sediments and gas concentration ([CO 2 ]) in ice cores. USGS Ice Core Lab, Denver, CO
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CO 2 Emissions Are the predicted changes for global warming larger or more rapid than past changes? How reliable are the predictions? Knowledge of past climates helps in judging the severity and uniqueness of potential future changes in climate. During the past 18,000 years, global mean temperature rose about 5 o C. While this approximates the predicted rise in global mean temperature (~4.2 o C), the rise at 3 o C per century will be faster than any warming that occurred during the last 18,000 years . USGS Ice Core Lab, Denver, CO
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Lecture4...1 - Global Climate Change CO2 Emissions The...

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