Friday, March 27, 2009

Images that make you think...

Click on picture to read journal article.

This is a picture of the polar ice cap as September 2007. The figure also gives you the boundaries in three different time periods. In the graph at the bottom of the figure, it gives the rate of melting. The rate has a sudden increase as of 2007. When the ice cap melts, it reflects less solar radiation and more is absorbed by the oceans. This absorption is a feedback that melts more ice, so the rate continues to increase.

Another frightening thing is the increase of greenhouse gases (GHG), mostly attributed to carbon dioxide.

Historically, the concentration of carbon dioxide is the highest that it has ever been. Doubter of global warming tells us it is a cycle. It is a cycle, but humans have influenced it so much that at the last peak the concentration of carbon dioxide was 325 parts-per-million (ice cores estimates from 100-millions years ago), now it is at 380 parts-per-million, far exceeding anything throughout geological history. Ten-time more rapid than geological changes!

Reflect on this for a while to see what we are doing

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