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Humans and Ecology: What are we doing, what should we do, what can we do, and does it matter?

Humans and Ecology: What are we doing, what should we do, what can we do, and does it matter?

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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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Page 1: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

Humans and Ecology:

What are we doing, what should we do, what can we do, and does it matter?

Page 2: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

Why are species going extinct?

Page 3: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

The complex molecules that comprise organisms are based on carbon

Page 4: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

Fig 55.14 Carbon cycle

Page 7: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

CO2 and other greenhouse gases keep heat from radiating back into space

http://www.esr.org/outreach/climate_change/basics/basics.html

Page 8: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

CO2 levels in Hawaii and average global temp.

Fig55.21

Page 9: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

Aren't these temperature increases just because of increased urbanization?

Fig55.21

Page 10: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

Aren't these temperature increases just because of increased urbanization?

http://science.nasa.gov/headlines/y2000/ast15nov_1.htm

Page 11: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

http://www.cabq.gov/albuquerquegreen/images/urban_heat_island.jpg/image

Page 12: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

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.

Page 13: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

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).

Page 14: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=1419

Poor sites showed a cooler maximum temperature compared to good sites.

Page 15: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=1419

For minimum temperature, the poor sites were slightly warmer.

Page 16: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=1419

The net effect was a cool bias in poorly sited stations

Page 18: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

Gases trapped in ice core bubbles can tell us about past climate conditions.

Page 21: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

Recent increases in global temperature have reversed a slight cooling trend

Page 22: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

Vikings in Greenland in the 1200-1400’s

Page 23: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?
Page 24: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

As the climate cooled, the Vikings were forced to abandon their outposts

Page 25: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

370

Page 27: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

~500 m people~300 m people ~2.5 b people

Relative contributions to Global Warming

Page 28: Humans and Ecology: What are we doing, what should we do,  what can we do, and does it matter?

Humans and Ecology:

What are we doing, what should we do, what can we do, and does it matter?