Evidence

Say hee, Iris, Mu sung, and Jae woong will edit this page.


 * __Forms of Evidence__**

- Available only from 17th century - Average rise of 0.6 degrees Celcius during 20th century
 * Temperature records**

- Growth dependent on climate (examine tree ring sizes, wood densities Oldest surviving trees around 4000 years old, but wood dead trees used to reconstruct climates back about 10,000 years
 * Tree Rings**

- Used to reconstruct climate of last Ice Age - Make use of chemical and physical properties of ice - Ice cores drilled in Greenland, Antarctica - Compacted snow stres record of climate
 * Ice Cores**

- Clues from rocks, compressed as sediment at bottom of oceans, then uplifted to be exposed on continents - Confirm ideas that continental drift and mountain building can change Earth's climate over time
 * Sea Sediments**

- Byproduct of burning fossil fuels, carbondioxide's concentration has incresed by 34% since pre-industrail times - Levels of atmouspheric methane has risen 145% in the last 100 years
 * Atmouspheric level**

- Many recent extreme weather records, droughts and flooding, happening in midwest according to National Oceaninc and Atmouspheric Administration
 * Extreme weather records**

http://www.ace.mmu.ac.uk/eae/Climate_Change/Older/Evidence.html


 * __Statistics__**

1970s: Carbon Dioxide levels only 17% above normal level Today: Sharp increase to about 30%

MAJOR CLIMATE CHANGE OCCURRED 5,200 YEARS AGO: EVIDENCE SUGGESTS THAT HISTORY COULD REPEAT ITSELF http://researchnews.osu.edu/archive/5200event.htm --> discusses evidence from several sources mentioned above http://unfccc.int/essential_background/feeling_the_heat/items/2904txt.php --> discusses extra-strength weather, decline of winter and shifts in the natural world as supports for climate change
 * Article:**

Interactive Polar Ice Cap Melter http://www.everybodysweather.com/Static_Media/Polar_Ice_Cap_Melter/index.htm --> compare the significant loss in Arctic sea ice from 1979 to 2005 http://www.net.org/warming/hurricane_globalwarming_animation.html--> Get an easy scratch of the global warming effect and the evidence, that is, the rate of stronger storms and hurricanes due to the increase in temperature of earth (because of green house effect).
 * Flash/animation:**