Many scientists believe that the level of carbon dioxide, as well as the earth's temperature has been steadily increasing in recent years as the result of the burning of fossil fuel. Yet many other scientists have challenged this thinking.
The world governments are pushing a massive world-wide reduction in the emission of greenhouse gases, carbon dioxide. The Cap and Trade scheme will cap the level of emissions in developed countries and trade this reduction to the developing nations resulting in a massive redistribution of wealth.
One doesn't have to be a climatologist to simply apply some critical thinking to this issue. The geologically recent ice age resulted in massive ice sheets extending to the middle of this continent, but subsequent warming long ago melted them back to the polar regions. What mechanism caused that massive reduction of ice? It was not the result of burning fossil fuels.
Scientists have also noted a decrease in the Martian ice caps in the last several decades. Mars certainly has no factories and automobiles. What has caused this? Is global warming a recent occurrence?
We have historical evidence of warm periods in the past. Greenland was farmed at one point and Newfoundland was called Vinland by the Vikings, probably due to the ability to grow grapes. But this was followed by centuries of cooling.
It seems more reasonable that global warming has more to do with fluctuations in solar output than with what man can do. The greatest influence upon life on the earth is our sun. Its mass is so huge that its gravitational pull is felt hundreds of millions of miles away. Its energy output is so enormous that it dictates our climate and sustains life on this planet. In comparison, man and what he does is minor.