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Humans and Ecology: What are we doing, what should we do, what can we do, and does it matter?. Why are species going extinct?. The complex molecules that comprise organisms are based on carbon. Fig 55.14. Carbon cycle. Solar energy: incoming and outgoing. - PowerPoint PPT Presentation
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Humans and Ecology:
What are we doing, what should we do, what can we do, and does it matter?
Why are species going extinct?
The complex molecules that comprise organisms are based on carbon
Fig 55.14 Carbon cycle
Solar energy: incoming and outgoing
http://www.esr.org/outreach/climate_change/basics/basics.html
http://www.esr.org/outreach/climate_change/basics/basics.html
CO2 and other greenhouse gases keep heat from radiating back into space
http://www.esr.org/outreach/climate_change/basics/basics.html
CO2 levels in Hawaii and average global temp.
Fig55.21
Aren't these temperature increases just because of increased urbanization?
Fig55.21
Aren't these temperature increases just because of increased urbanization?
http://science.nasa.gov/headlines/y2000/ast15nov_1.htm
http://www.cabq.gov/albuquerquegreen/images/urban_heat_island.jpg/image
http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=1419
A poorly sited temperature sensor in Marysville, California. The sensor is situation right next to an asphalt parking lot, instead in the middle of a grassy field, as it is supposed to be. The sensor is also adjacent to several several air conditioners that blow their exhaust into the air nearby.
http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=1419
Annual average maximum and minimum unadjusted temperature change calculated using (c) maximum and (d) minimum temperatures from good and poor exposure sites (Menne 2010).
http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=1419
Poor sites showed a cooler maximum temperature compared to good sites.
http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=1419
For minimum temperature, the poor sites were slightly warmer.
http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=1419
The net effect was a cool bias in poorly sited stations
http://www.esr.org/outreach/climate_change/basics/basics.html
Gases trapped in ice core bubbles can tell us about past climate conditions.
http://www.esr.org/outreach/climate_change/basics/basics.html
http://www.esr.org/outreach/climate_change/basics/basics.html
Recent increases in global temperature have reversed a slight cooling trend
Vikings in Greenland in the 1200-1400’s
As the climate cooled, the Vikings were forced to abandon their outposts
370
Effects of global warming are already visible
http://www.worldviewofglobalwarming.org/pages/glaciers.html
~500 m people~300 m people ~2.5 b people
Relative contributions to Global Warming
Humans and Ecology:
What are we doing, what should we do, what can we do, and does it matter?