On 24 Feb, 22:19, "HeyBub" <hey...@[EMAIL PROTECTED]
> wrote:
> tim wrote:
>
> > The only globally significant effects are indirect ones such as CO2
> > causing an increase in retention of solar radiation.
>
> Are you aware that the concentration of CO2 in the atmosphere amounts to
> three one-hundredths of one percent? That's 0.00338% (or 300 parts per
> million).
>
> There are those who think that an increase in this number, say doubling
or
> tripling, would have a detectable effect on the earth's temperature.
>
> They believe this because there's no way GW can be attributed to humans
> otherwise.
Those same people will also point out that a slight increase in CO2
level will improve plant productivity but that a doubling of the
level will have a negative effect on plant productivity.
