QUOTE(SlyShadow @ Mar 20 2006, 07:13 PM)
think the ozone layer only protects us from the harmful uv rays from the sun...its the co2 atmosphere that causes the greenhouse effect. in some scientific predictions, the earth will be like venus in a few million years and the sun will swell up and expand whereas venus' dense atmosphere traps all the heat and dries up everything.
but for now,its just a no real impact cycle thats going on. the polar caps will melt and evaporate like in the sumemr then it will freeze up again later in the cold months of the year or in winter.
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I agree that earth will most likely become another Venus in sometime as the sun swells but when the sun gets to a certain size the earth might stop cooling down. By that time I hope humans would've found out how to get safetly elsewhere.