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Global Warming Inconvenient truth handout Physics of anthropogenic global warming Key diagrams Consequences What can you do? What causes Global Warming? Addition of greenhouse gases to atmosphere Main culprits are Carbon Dioxide, Methane, and water Trees take up CO 2 Animals Produce

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global warming

Global Warming

Inconvenient truth handout

Physics of anthropogenic global warming

Key diagrams

Consequences

What can you do?

what causes global warming
What causes Global Warming?
  • Addition of greenhouse gases to atmosphere
  • Main culprits are Carbon Dioxide, Methane, and water
slide4

Trees take up

CO2

Animals

Produce

Methane

CS Fig. 15.20

4

basic physics
Basic Physics
  • Greenhouse gases trap heat in Earth’s atmosphere
  • Greenhouse gas concentrations have risen
  • Trapped radiation has been measured
  • Planet will warm!!!!
has the burning of fossil fuels resulted in increased co2 concentrations in the atmosphere

Has the burning of fossil fuels resulted in increased CO2 concentrations in the atmosphere?

Yes!

Measurements of air in Hawaii

Measurements of ancient air preserved in ice

slide12

Bubbles in glacial

ice preserve

air of past cent-

uries:

Tell us what CO2

concentrations

were like before

the industrial

revolution

longer records

Last

Interglacial

Current

Longer records

Current

CO2 levels

are well above

range observed

during recent

geologic

history

associated with

the ice ages

best evidence that recent warming is anthropogenic

Can’t account

For recent warming

Can’t account

For prior warming

Works!

Best evidence that recent warming is anthropogenic

Three years in the

1990’s are the

warmest in the

Northern Hemisphere,

by far, of the last

400 years!

Data from Mann

and others,

Nature, 1998;

Figure from

IPCC 2001

Report

consequences
Consequences
  • Planet will warm
    • High latitudes will warm more than low latitudes
  • Sea level will rise
  • Questions:
    • How fast will warming and sea level rise occur
    • How will Earth’s weather patterns be affected
global temperatures projected to rise 3 to 7 f

Global Temperatures projected to rise3 to 7 °F

IPCC 2007

http://www.ipcc.ch/pdf/assessment-report/ar4/syr/ar4_syr_spm.pdf

slide17

The maximum degree of global warming, as predicted by 95,000 home computers

Stainforth, D. A. et alNature433, 403−406 (2005).

change in minnesota
Change in Minnesota

“Recent research indicates a warming trend in Minnesota. A study of the climate record at Fort Snelling shows an increase of 2.9°F in average annual temperature between the 1860s and 1987, almost three times the worldwide average. Analyses of more than a hundred temperature-depth profiles in North America show that ground latitudes comparable to Minnesota’s indicated ground warming of up to 3.6°F.”

From “Playing with Fire, Global Warming in Minnesota” 1999; data from Baker and Skaggs, 1989