Verified answer

Carbon dioxide (and other GH gases) warm the atmosphere. In very basic term light from the Sun passes through the atmosphere and is turned into IR energy after reaching the earths surface. This IR (heat) then rises and some is held by GH gases the rest radiates back to space 99% of the atmosphere is transparent to this heat (oxygen and nitrogen)

More detail here http://climate.jpl.nasa.gov/causes/

Atmospheric dust blocks light reaching the surface and has a cooling effect, which has been noted after several major volcanic eruptions like Pinatubo in the 90s.

You can't "accept" the concept of climate change without accepting the concept of global warming. If we had climate change without ever having global warming, the Earth's atmosphere would be at 0°K and the climate would no longer exist. If you are asking, "Do you accept the concept of Climate Change, but not *Anthropogenic* Global Warming?" My answer would be "mostly yes." The climate is always changing. It always has and always will. Without perpetual climate change throughout geologic history, we would have no sedimentary rocks. Anthropogenic activities do affect the process of climate change. In some localities (i.e. cities) AGW is real and often very pronounced. Deforestation and other land use changes definitely affect the natural process of climate change. Anthropogenic greenhouse gas emissions minimally contribute to the Earth's natural greenhouse effect. Mankind's presence on the Earth alters the ecology of the Earth. It's impossible for us to exist in a system without altering that system. That's life. The Enviromarxists need to accept that fact and leave the productive segment of society the heck alone.

What I understand is that the CO2 is suppose to trap the heat better then air. From what I understand is that when they used dry CO2 it reacted similar to normal dry air. It wasn't until they added high humidity that the CO2 held heat better just like air does. For the dust particles, too much can reflect light away from the Earth actually cooling it.

Carbon dioxide is a greenhouse gas, and so it contributes to the greenhouse effect, which makes the planet warmer.

http://en.wikipedia.org/wiki/Greenhouse_effect

http://science.howstuffworks.com/question746.htm

http://earthguide.ucsd.edu/virtualmuseum/climatech...

Dust particles reflect sunlight, and so contribute to global cooling.

http://en.wikipedia.org/wiki/Aerosol

http://en.wikipedia.org/wiki/Global_dimming