Human pollution leads to environmental stability!

I wonder how difficult it will be to engineer a stable climate in a
Habitat considering new data that appears to point to a very
unstable Earth environment that has been stabilized over the last
few millenia by the activities of humans.

http://www.nytimes.com/2003/12/10/science/10WARM.html?
ex71637200&en=5caf39d17010ecfd&ei=5062&partner=GOOGLE

"The climate of the last 10,000 years has been unusually stable,
allowing civilization to flourish. But that is only because people
chopped down swathes of forest in Europe, China and India for
croplands and pastures, Dr. Ruddiman said. Carbon dioxide released
by the destruction of the forests, plus methane, another heat-
trapping gas, produced by irrigated rice fields in Southeast Asia,
trapped enough heat to offset an expected natural cooling, he said."

""The stability is an accident," Dr. Ruddiman said."

"Levels of carbon dioxide and methane rise and fall in natural
cycles lasting thousands of years, and both reached a peak at the
end of the last ice age 11,000 years ago. Both then declined as
expected."

"Both should have continued declining through the present day,
leading to lower temperatures, and a new ice age should have begun
4,000 to 5,000 years ago, Dr. Ruddiman said. Instead, levels of
carbon dioxide reversed 8,000 years ago and starting rising again.
The decline in methane levels reversed 5,000 years ago, coinciding
with the advent of irrigation rice farming."

If we base our climatic engineering on trying to replicate natural
processes in the mistaken impression that such processes are indeed
stable what could we expect to see in the Habitat?

This type of information leads me to favor the view that Habitat
environments will be mechanistic rather than holistic. All of the
terraforming science might actually lead to instability and a
process run amok if the human mitigating influences are removed
(i.e. farming to specialized modules, no industrial CO2 and methane
release into the atmosphere, etc.)

What do you think?

TangoMan