Quote:
Originally Posted by brokensickle
Outside of the increase in solar radiation there is no hard evidence that
the levels of CO2 are the cause of global warming. Compared to Venus we have a minute amount of greenhouse producers.
Ivan
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Was just looking at the NASA website, they were basiclly saying there has been a small increase in solar activity in the past 25 years which goes in cycles. But not enough to account for the increase in global temperatures in the past 10 years.
(specificly it has increased by 0.05% in the past decade, the total effect it would have on temperature is estimated to only be between 4-20% of the actual temperature variation were seeing right now with greenhouse gases beleived to make up the other 80%+)
I don't see what point making a comparison to Venus is making, if Venus has alot more CO2 and is warming from the insulating effect would that not be proof global warming from rapid increases in CO2 levels can occur?
I do have an interesting question though, as I think there are probably alot of people who are like minded to what you beleive, what type of 'hard evidence' would it take to convince you climate changes are occuring from CO2 levels increasing?
Heres the direct link from NASA:
http://earthobservatory.nasa.gov/New...100116003.html