Temperature EffectsAll of the dust in the air from the impact and soot from the fires will block the Sun. For several months you cannot see your hand in front of your face! The dramatic decrease of sunlight reaching the surface produces a drastic short-term global reduction in temperature, called impact winter. Plant photosynthesis stops and the food chain collapses. The cooling is followed by a much more prolonged periodof increased temperature due to a large increase in the greenhouse effect.The greenhouse effect is increased because of the increase of the carbon dioxide and water vapor in the air. The carbon dioxide level rises because the plants are burned and most of the plankton are wiped out. Also, water vapor in the air from the impact stays aloft for awhile. The temperatures are too warm for comfort for awhile. In the early 1990s astronomers requested funding for an observing program called Spaceguardto catalog all of the near-Earth asteroids and short period comets. The
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