Roxana Cooper Wrote:
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> It is futile because not only is the human
> contribution to atmospheric carbon in the minor
> compared to natural sources


How do we know that recent CO2 increases are due to human activities?

Quote

Over the last 150 years, carbon dioxide (CO2) concentrations have risen from 280 to nearly 380 parts per million (ppm). The fact that this is due virtually entirely to human activities is so well established that one rarely sees it questioned. Yet it is quite reasonable to ask how we know this. [...]

Regards,
Tommi

"In this house, we obey the laws of thermodynamics!"
-Homer J. Simpson