Re: [Phys-l] Climate Change - Is it Controversial?

[David Appell <appell@nasw.org>]

kyle forinash wrote:
> The amount of CO2 in the air is 30% higher than it has been in the past 
> 800,000 years (150% for methane). This extra amount can be accounted for 
> (approximately) by adding up what has been released by carbon fuel 
> burning (all types) by humans since the industrial revolution (total 
> energy consumption has increased by about 100x).

Scientists have done better than that. The "extra" CO2 in today's 
atmosphere can be definitely identified as of human origin, by its 
carbon isotopes and radioactive signature.

See http://www.realclimate.org/index.php?p=87

David