the polar bear climate change photo

Started Mar 24, 2007 | Discussions thread
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Dominic Groß Veteran Member • Posts: 7,181
Re: The Answer Is

Tom Rowland wrote:

Most of what is called global warming is really a discussion about
how much infra red blocking atoms and molecules slow down the rate
of global cooling. The infra red blocking stuff is composed of
about 95% water vapor and 5% CO2 (but some guys say it is closer to
97% water and 3% CO2).

Actually the numbers are a bit different, depending on the source greenhouse gases are responsible for maybe 15-40% of the blocking, if I recall correctly exact numbers can't be given because they vary a lot depending on latitude and the mixture of the gases.

And probably 90% or so of the CO2 is from
natural sources, not man made sources.

hm the concentration of CO2 has varied been between 180 ppm and 300 ppm for thousands of years, we pushed it to 375 ppm. So our contribution certainly seems significant to me.

Of course all this only leads to questions of climate sensitivity (how much a doubling of the CO2 concentration would affect temperature), while there are different numbers here again just about every serious research points to a considerable warming effect...

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