More water vapor in the air will result in more precipitation during the heaviest precipitation events. It will also result in more thunderstorms, and thus more lightning, and more probability of tornadoes.In recent decades scientists have observed that the water vapor content of the atmosphere has increased.Water vapor is 60% of the natural greenhouse effect. So more water vapor in the atmosphere results in a strengthening of the greenhouse effect, and more heat being retained in the atmosphere. Water vapor is five timesmore effective as a greenhouse gas than is CO2.Consequently global temperatures will increase as a result of this positive feedback.
2) Decreasing perennial sea ice in the Arctic Sea:In its early stages, as climate change advances, much of the excess heat produced is circulated to the polar regions by global winds and ocean currents.This warms the air and water in the Arctic Sea. Warmer air and water in the Arctic melts some perennial sea ice by the end of the summer (early September). Perennial sea ice is the ice that covers the surface of the Arctic Sea all year long.Less sea ice in the Arctic reduces planetary albedo, meaning that the blue water that replaces the ice absorbs more insolation. Arctic waters then radiate heat into the atmosphere, helping melt more ice.Warmer Arctic Sea waters also melt more ice over time.For example the Arctic Sea lost 30,000 square miles of sea ice per day in August 2012.
By 2032 AD, the Arctic Sea could be ice free at the end of the summer.An ice free Arctic Sea could affect the polar jet stream, and thereby could make Europe colder than it is now.Already we have seen that significant, persistent drought in the Western USA, bought about by climate change, has resulted in numerous wild fires which have sent vast quantities of dust and soot to the Arctic Sea ice. This dust and soot darkens the polar ice, reducing its albedo and facilitating its faster melting.
3) Deforestation of Tropical RainforestsMassive deforestation of the tropical rainforests results in:a) The trees being burned and adding the carbon that they have stored back into the atmosphere.b) The burned trees no longer being able to take carbon dioxide out of the atmosphere and store it in their trunks and branches. Thus when the forests are cut down, a “sink” for atmospheric carbon, that would otherwise exist, is eliminated. c) Warmer temperatures activating more pests that debilitate trees and hasten their deaths, especially under drought conditions.d) Warmer temperatures in some cases result in the deaths of trees, allowing release of more carbon into the atmosphere.
e) Tropical rain forests covering vast areas also absorb massive quantities of solar radiation to carry out photosynthesis. This Sun’s energy (insolation) is thus not used to heat the Earth’s surface. So less energy is absorbed and reradiated, thereby reducing temperatures.
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