Fact 2!

Fact 2: The more carbon dioxide there is in the atmosphere, the hotter the temperature.

Source 1:
http://www.umich.edu/~gs265/society/greenhouse.htm

1. The sources are Nick Hopwood and Jordan Cohen.
2. Credentials: They attend the University of Michigan
3. The source is very credible
4. The source says, "the Earth has increased in temperature by about .5 degrees Celsius and many scientists believe this is because of an increase in concentration of the main greenhouse gases: carbon dioxide, methane, nitrous oxide, and fluorocarbons."
5&6. I believe the source because their credentials sound very professional and they state facts in many various ways such as graphs and tables.


Source 2:
http://papundits.wordpress.com/2009/02/27/carbon-dioxide-emissions-or-just-more-hot-air/

1. The source is Dr. William Happer.
2. Credentials: Professor of Physics at Princeton, Once worked at the Department of Energy but was once fired by Al Gore.
3. The source seems to be very credible.
4. The source says, ""Many people don’t realize that over geological time, we’re really in a CO2 famine now. Almost never has CO2 levels been as low as it has been in the Holocene [geologic epoch] - 280 [parts per million (ppm)] - that’s unheard of,” Happer said. “Most of the time, it’s at least 1,000 [ppm] and it’s been quite higher than that.”

Happer said that when CO2 levels were higher - much higher than they are now, the laws of nature still managed to function as we understand them today.

“The earth was just fine in those times,” Happer said. “You know, we evolved as a species in those times, when CO2 levels were three or four times what they are now. And, the oceans were fine, plants grew, animals grew fine. So it’s baffling to me that, you know, we’re so frightened of getting nowhere close to where we started.”

5&6. I do not believe the source because he does not give evidence that the amount of carbon dioxide is affecting life today.

Source 3:
http://www.astrobiology.com/news/viewsr.html?pid=29101

1. The source is Astrobiology Magazine
2. Credentials: They have a magazine?
3. This source is fairly credible.
4. The source says, "The result improves our understanding of how carbon dioxide in the atmosphere can affect the global temperature of Earth. Today, carbon dioxide levels on Earth are increasing, primarily as a result of human activities. This increase is one of the most important causes of climate change on Earth. Understanding how carbon dioxide affected the ancient climate of Earth might provide clues about the future of Earth's climate and global biosphere. The result improves our understanding of how carbon dioxide in the atmosphere can affect the global temperature of Earth. Today, carbon dioxide levels on Earth are increasing, primarily as a result of human activities. This increase is one of the most important causes of climate change on Earth. Understanding how carbon dioxide affected the ancient climate of Earth might provide clues about the future of Earth's climate and global biosphere."
5&6. I believe this source because what they are trying to explain seems to be very logical.


I believe this fact because simple science can explain and demonstrate how changes in carbon dioxide can change the temperature of the Earth.