Photo: remember when 2 outlets per wall was more than enough??
Here we see the typical saw-tooth pattern of temperature which marks the short interglacial (warm) periods followed by longer glacial periods. In every case, CO2 records and temperature records correlate. What will happen in our newly CO2-enriched climate, however, is anybody’s guess. Scientists have used computer models to show that temperatures will likely increase between 3 and 11 °F over the next 100 years. Following every peak in CO2, there is an immediate drop. This happened 10,000 years ago, but slowed once humans began agricultural activity. Now, the level of CO2 is skyrocketing and is expected to exceed 600 ppm by 2050!
Air bubbles trapped in ice cores allow us to extend this CO2 record back about a million years.
Decades ago, climate scientists told of the predicted patterns of UNNATURAL climate change caused by increasing greenhouse gas concentrations. They nailed the patterns. What they predicted is exactly what we are seeing.
Images of Kilimanjaro taken from the shuttle in 1993 and in 2000.
Albedo feedback is apparent when comparing NH snow cover from January 2004, for example, to July 2004 (next slide). Caption: This image shows the Earth in January 2004 from the Blue Marble: Next Generation. Credit: NASA Earth Observatory . See: http://www.nasa.gov/vision/earth/features/bmng_gallery_3.html And: http://earthobservatory.nasa.gov/Newsroom/BlueMarble/BlueMarble_monthlies.html
As glaciers melt in a warmer climate, sea levels rise.
Satellite images reveal a widening melt area in early summer each year.
Here’s what FL’s coast looked like.
Species of land animals are disappearing faster now than any time since the dinosaurs were wiped out 65 million years ago. From polar bears in the Arctic no longer having sea ice for hunting, mating, and migration, to frog in the tropics, we are losing species fast, and humans are almost completely to blame. Increased winds are carrying dust farther, worsening conditions like allergies and asthma, while longer breeding seasons for insects are helping spread insect-borne disease like malaria.
GLOBAL WARMING A WARNING FOR LIFE
<ul><li> * It is simply defined as the increase in the earth’s atmosphere by green house gases. </li></ul>WHAT IS GLOBAL WARMING?
800 600 400 200 0 CO 2 (ppmv) Thousands of Years Before Present 240 300 270 210 180 Petit et al., 1999; Siegenthaler et al., 2005; EPICA Community members, 2004 Temp. Proxy Present CO 2 concentration (386 ppmv) CO 2 concentration after 50 years of unrestricted fossil fuel burning (600 ppmv)
Sea-level rise <ul><li>Temperatures and sea levels will continue to rise for centuries. Arctic sea ice will disappear in the next few decades Hot extremes, heat waves, and heavy rains will continue to become more frequent </li></ul>Global warming facts (IPCC, 2007):
Sea-level rise <ul><li>Thermal expansion </li></ul><ul><li>Addition of water </li></ul><ul><li>Freshening of water </li></ul><ul><li>Melting ice sheets </li></ul><ul><ul><li>Greenland: 7.4 m (25’) potential </li></ul></ul><ul><ul><li>Antarctica: 74 m (250’) potential </li></ul></ul><ul><ul><ul><li>West Antarctica (7 m) </li></ul></ul></ul><ul><ul><ul><li>East Antarctica (67 m) </li></ul></ul></ul>