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Welcome!
Your search for information about "how much
warmer is the earth likely to become?" is
successful!
 The
Third Assessment Report of the IPCC projects that
the Earth's average surface temperature will
increase between 2.5° and 10.4°F
(1.4°-5.8°C) between 1990 and 2100 if no
major efforts are undertaken to reduce the
emissions of greenhouse gases.
This is significantly
higher than the Panel predicted in 1995
(1.8°-6.3°F, or
1.0°-3.5°C).
Scientists predict that
even if we stopped emitting heat trapping gases
immediately, the climate would not stabilize for
many decades because the gases we have already been
released into the atmosphere will stay there for
years or even centuries.
So while the warming
may be lower or increase at a slower rate than
predicted if we reduce emissions significantly,
global temperatures cannot quickly return to
today's averages - it will take years, if not
centuries.
The faster and more the
earth warms, the greater the chances are for some
irreversible climate changes.
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