climate change. i. the earth's climate has changed many times, due to natural causes. **there...
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![Page 1: Climate Change. I. The Earth's Climate has changed many times, due to natural causes. **There have been at least 4 Ice Ages in the last 3 million years](https://reader036.vdocument.in/reader036/viewer/2022062404/551b4ddf550346dd1a8b5d6a/html5/thumbnails/1.jpg)
Climate Change
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I. The Earth's Climate has changed many times, due to natural causes.
**There have been at least 4 Ice Ages in the last 3 million years - with only a 5 degree C cooler difference!
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Four major continental glaciations are recorded in North America. The last began about 70,000 years ago, and ended 10,000 years ago. The ice moved as far south as Missouri.
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II. What Are Some Natural Causes of Climate Change?
(A) Changes in the Earth's Orbit (tilt or shape) - cycles from 20,000 to 100,000 yrs.
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(B) Changes in the amount of energy coming from the Sun
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C) Volcanic emissions (lava, gas, etc.)
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(D) Comets or meteorites hitting earth
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III. Has the World's Climate Changed in the Last 100 Years?
ANSWER: YES. (1) The average surface temperature has increased by about 1°F.(2) Snow cover and ice extent have decreased.(3) The sea level has risen by 4-8".
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EVIDENCE OF GLOBAL TEMPERATURE
INCREASES SINCE 1900:
(A) Recorded temperature changes(B) The observed rise in sea level of 4-8
inches(C) The shrinkage of mountain glaciers(D) Reduction of northern hemisphere snow
cover(E) Increasing sub-surface (below surface)
ground temperatures
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IV. Have Humans Caused Some of the Recent Climate Changes?
ANSWER: POSSIBLY.
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SOME HUMAN ACTIVITIES MIGHT BE:
(A) Burning of fossil fuels (coal, oil, and natural gases)
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(B) Global Deforestation
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