why are some scientists concerned about...............continued in details?

Question

increased levels of carbon dioxide in the atmosphere as a result of burning fossil fuels?

Answer 1

Carbon Dioxide is known as a greenhouse gas. It traps heat. Increased levels of it will mean the Earth will hold more heat in the air which may contribute to global warming.

Answer 2

Look at Venus. It has a lot of carbon to absorb and hold in heat and its surface temp is like 900F. A atmosphere on a planet is like a blanket. Nitrogen may be like a sheet, but carbon is a heavy wool blanket.

http://groups.google.com/group/neat-astronomy?hl=en