Phil L wrote:

Phils question was delightfully simple, I'll re post it so you can't
ignore it;
"If it was first noticed 100 years ago, it's fairly safe to say that
it had been occuring for centuries before that, so how is it
mankind's fault, when the world population 300 - 400 years ago was a
tiny fraction of what it is now, and virtually none of them used
fossil fuels?" Got any answers ****wit?

snip

The wiki page got boring after 2 minutes, but I didn't see any explanation
as to when this 'trend' began, or any possible causes

That is the problem with science. Far too boring to be interesting to
all too many people.

But the greenhouse effect has always been with us (at least as long as
there have been greenhouse gases in the atmosphere). Fourier, Tyndall
and Arrhenius all played their part in developing the theory.

I'm not denying that climate change is occuring, I'm just saying that it's
highly unlikely to have anything whatsoever to do with mankind.
The earth regularly warms and cools over millions of years, or occasionally,
very rapidly. This has occured hundreds, if not thousands of times according
to scientists, and yet mankind has only been around for one, maybe two of
these cycles.

The is quite a long list of things that contribute to the variability of
climate. One of these is the CO2 concentration in the atmosphere. This
is now about 50% above the pre industrial level. You might not think
that the huge amount of CO2 resulting from human activity in the recent
past has anything to do with this rise or with climate change but the
great majority of the scientists who investigate such matters do.