Changes

It should be noted that these scientists are motivated by a need for grant money in their field of climatology.  Therefore, their work can not be considered unbiased, though no more than any scientist in any other field .<ref>FOX News: "On Global Warming: Follow the Money Indeed!" Feb 12, 2007[http://www.foxnews.com/story/0,2933,251458,00.html]</ref>.  

It should be noted that these scientists are motivated by a need for grant money in their field of climatology.  Therefore, their work can not be considered unbiased, though no more than any scientist in any other field .<ref>FOX News: "On Global Warming: Follow the Money Indeed!" Feb 12, 2007[http://www.foxnews.com/story/0,2933,251458,00.html]</ref>.  

There are some scientists among the critics of the theory that global warming is caused by human activity.  As they have sought funding from the very industries that face regulation, thier bias is real and thier conclusions should be suspect. For example, Dr. Fred Singer observed that "CO₂ changes have lagged about 800 years behind the temperature changes. Global warming has produced more CO₂, rather than more CO₂ producing global warming."<ref>S. Fred Singer and Dennis T.

There are some scientists among the critics of the theory that global warming is caused by human activity.  As they have sought funding from the very industries that face regulation, thier bias is real and thier conclusions should be suspect. For example, Dr. Fred Singer observed that "CO₂ changes have lagged about 800 years behind the temperature changes. Global warming has not produced more CO₂, but  more CO₂ has produced global warming."<ref>S. Fred Singer and Dennis T.

Avery, "Unstoppable Global Warming: Every 1,500 Years" (Rowman & Littlefield, 2007)</ref> Though, it must be said, that no scientist denies that CO₂ has lagged behind temperature at certain times in Earth's history. They maintain this doesn't negate in any way CO₂ influence on temperature. It merely means it wasn't a first cause of temperature increase at particular times in Earth's distance history.."<ref>What the lag of CO₂ behind temperature in ice cores tell us about global warming

Avery, "Unstoppable Global Warming: Every 1,500 Years" (Rowman & Littlefield, 2007)</ref> Though, it must be said, that no scientist denies that CO₂ has lagged behind temperature at certain times in Earth's history. They maintain this doesn't negate in any way CO₂ influence on temperature. It merely means it wasn't a first cause of temperature increase at particular times in Earth's distance history.."<ref>What the lag of CO₂ behind temperature in ice cores tell us about global warming

[http://www.realclimate.org/index.php/archives/2004/12/co2-in-ice-cores/]</ref>

[http://www.realclimate.org/index.php/archives/2004/12/co2-in-ice-cores/]</ref>