I was watching the history channel, and the ...

Put a small piece of ice on your counter for a few days in a row and try to estimate how long it takes to melt. Depending on the temperature and activity in your house the ice cube will most likely never melt at the same exact rate --but still it'll be melting in it's "natural" surroundings. Then do it one more time and use a hot hair dryer to blow on it and see what effect it has on the speed of the ice melting. Think of the hair dryer as being an unnatural force like global warming is thought of. While nature does go through many cycles that affect all aspects of the planet and weather, man-made pollution --because it's so gigantic, can and does affect Earth's environment from the soil to the waters to the sky.

I think your on to something with the Earth climate repeating hot and cold periods. There is much talk about global warming , But the planet has gone thru ice ages and very hot periods far more heat then our brief time of pollution mere max 80 years if that vs 100's  even thousands of years of massive Volcanic eruptions happening around the world. So yes the planet has gone thru many cycles of hot and cold spells and there are many experts on both sides debating these issues, And they will go on debating Global warming.
I think they be better off in getting better telescopes to survey space for E.L.E. Extension Level Event. We have the ability to may be deflect a E.L.E. meteor if , if seen early enough, Because it will only take only 1 small 6 mile meteor to wipe away almost all life on the planet. Certainly we will be gone that's for sure. As It been said many times, It has happened before and it will happen again.   

the cycles have long been known [well, at least for the last 50 years], it is just humans have accelerated the current cycle many fold, with unforseen conequeses, and may even have the ironic result of hurling us back into an ice age thousands of years before the cycles of past ice ages have told us of earlier intra-glacial periods.

the wrming has the effect of releasing so much freach water into the oceans that the nice salt water heat exchange pumps of the deep ocean currents, the Gulf Stream among many, and interrupt the current the benifical [to us] currents of the oceans.

there is more.   just ask

doug

Sun spots have been studied and it has been determined that there is no correlation between sun spots and temperature changes.  Get over that one.

Volcanoes have an instant effect on weather but because the dust does not remain in the atmosphere for more than a few years it has little or no effect on climate.  Get over that one.

The scientists who deny man-made global  change are outnumbered by the scientists named Steve that believe the evidence is there for man made climate change.

Most animal species adapt to the changing climate. The changes that are happening now are so rapid that many species will not be able to adapt. The polar bear will not adapt to the climate change.

The earth has a tilt or wobble. Over many millennium the ice cap changes caused the wobble to change. This change caused climate change which accelerated until the tilt moved in the other direction and the cycle reversed. The total amount of heat energy reaching the earth does not change.

The ocean is a conveyor belt for balancing the earth's temperature. If there was no ocean conveyor belt the ocean surface would freeze solid. This had happened before life had evolved but could not happen now because of continents.

Today atmosphere changes have reached the tipping point, there is nothing that can be done to slow climate changes so go ahead and burn baby burn. As the climate changes the glaciers will be sliding into the oceans.  In 2000 years the earth will be a different world.