The only other proposed alternatives are "natural cycles", the Sun, and galactic cosmic rays.
We know it's not the Earth's natural cycles, because scientists are well-aware of these, and we're in a cooling cycle right now.
http://en.wikipedia.org/wiki/Milankovitch_cycle#The_future
Solar output has decreased over the past 30 years as global warming has accelerated rapidly
http://news.bbc.co.uk/2/hi/uk_news/6290228.stm
and even solar physicists don't think the Sun is the main cause of the current warming
http://solar-center.stanford.edu/sun-on-earth/glob-warm.html
The galactic cosmic ray theory has many fundamental problems.
http://answers.yahoo.com/question/index;_ylt=Ahuxfpv5RzyHSeqsVZ1fxnEjzKIX;_ylv=3?qid=20071030112550AA7AXSu
These theories cannot explain scientific observations such as a cooling upper atmosphere and greater warming at night than during the day, either.
Even if you're not convinced by AGW, do you agree it's the most likely explanation?
2007-12-26
04:20:59
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40 answers
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asked by
Dana1981
7
in
Global Warming