GEOL6338: Paleoclimate and Global Change

1
All climate scientists agree that
1) Earths average surface temperature has warmed
by 0.74C in the last century, a conclusion based
on direct measurements. 2) Concentrations of CO2,
CH4, and other greenhouse gases have built up
over the last 100 years due to human activities.
http//www.globalwarmingart.com
2
The average temperature of the Earth is hotter
now than it has been any time during the last
2000 years.
http//www.globalwarmingart.com/
3
This warming is not spatially uniform. Most areas
are warming, but some are cooling.
http//www.globalwarmingart.com/images/a/aa/Global
_Warming_Predictions.png
4
CO2 from fossil fuel combustion is increasing in
the atmosphere each year. CO2 is the primary
cause of climate change.
http//www.globalwarmingart.com/images/d/d3/Carbon
_Dioxide_400kyr_Rev.png
5
The levels of CO2 in the atmosphere today are the
highest in more than a 400,000 years.
http//www.globalwarmingart.com/images/d/d3/Carbon
_Dioxide_400kyr_Rev.png
6
Each American uses more energy and consequently
puts more than 5 tons of CO2 in the atmosphere
each year.
(C_2002, Pop_2005) http//www.globalwarmingart.com
/images/c/c3/Fossil_Fuel_Efficiency.png
7
20 of the CO2 emitted today will still be in the
atmosphere 300 years from now. 10 will still be
there in 10,000 years.
II. Past climate How did we get here?
http//www.globalwarmingart.com