Melissa+Hodgins

What if we examine a longer period of time—say, the past 1,000 years? This presents a problem since accurate records of temperature were not kept prior to the middle of the 19th century. But there are ways of estimating temperature from other information such as the size of growth rings on trees and the composition of ice taken from Antarctica and Greenland. The records used for these indirect measurements of temperature are called “proxy data.” Find out more about how temperature estimates are made from [|proxy data]. (http://www.seed.slb.com/en/scictr/watch/climate_change/change.htm) New Ice age Prediction?? In about 10,000 to 100,000 years, the study suggests, Antarctic-like "permanent" ice sheets would shroud much of [|Canada], [|Europe], and [|Asia]. (http://news.nationalgeographic.com/news/2008/11/081112-ice-age-global-warming.html)


 * The greenhouse gasses are one of the biggest things that are causing the ice sheets to melt because of the Co2.


 * [[image:http://www.esd.ornl.gov/projects/qen/lastgla.gif]]

The following ecosystems maps, compiled by Jonathan Adams, are still under development and as-yet unpublished. Their presentation here is intended to provoke comment and criticism which can lead to them being improved. They are based on simple compilations of the available information in the literature, relying heavily on the conclusions given by review papers for each subregion. Dates are given in radiocarbon years; the actual chronology in terms of 'real' years is still being worked out in the literature. (http://www.esd.ornl.gov/projects/qen/nerc.html)


 * I believe that the warming trends are going to make the ice sheets melt. the ice sheets are suppose to last about 4 million years and right now they have only been lasting about half a million years. so I think that is telling us as humans that we are not taking care of our planet.
 * [[image:http://upload.wikimedia.org/wikipedia/commons/thumb/0/02/Arctic_Sea_Ice_Age2008.png/800px-Arctic_Sea_Ice_Age2008.png width="559" height="357"]]
 * In the Arctic, sea ice extent fluctuates with the seasons. It reaches its peak extent in March, near the end of Northern Hemisphere winter, and its minimum extent in September, at the end of the summer thaw. In September 2007, Arctic sea ice extent was the smallest area on record since satellites began collecting measurements about 30 years ago.