I think global is a very serious problem i mean if you do recent day taught geography you realise how serious it is. And i think it has alot to do with human technology but it would have occured with or without it. Without it it would be much much slower

no it is not caused by us and it does not appear to be happening according the scientists. They now report that the polar ice caps are not melting, it is actually colder and has snowed more than ever before, There is more ice than ever and the temperature of Earth is dropping and it is getting a bit cooler not hotter. We have nothing to do with it at all - never have had. The temperature of the Sun is changing - that is the cause and is also why we can not only fail to be the cause, but we cannot stop it happening. Oh, and Polar Bear numbers have been increasing for years and years - there are more in 2008 than we have ever had on this planet. The car, the lightbulb and the plastic bag have attributed sod all and nor have we - ever. How could we - we haven't had the time to do anything - we haven't actually been around that long. It is, I am afraid, just a very easy way to increase taxes and make money and that is why they constantly beat us about the head with their big 'climate change stick'. Sod the lot of 'em - I drive everywhere I can!

It is a huge left-wing conspiracy..humans are blameless..environmentalists and liberals are out to destroy big business, so they have banded together with faux scientists to create a situation that tries to frighten people...hmmm...that seems familiar to me...oh, right...that's what "the decider" and dickie c and all their neocon henchmen have been doing for 7 years..maybe I'm confused..maybe the conspiracy exists with the right wing and they are doing it to destroy the liberals..crafty, clever little neocons..:(

Oops! Meant this to be a comment...:-P..

Global warming is a problem. There are many studies that show this. We can see glaciers receding - including on mountain tops, and it is measurable. You can map an inversely proportional link between the deforestation of the South American rain forests and the growth of the Sahara Desert. This isn't myth. I think there are components of both natural cyclical climate change on Earth and human behavior. The funny thing is that the "Is Global Warming Real" question isn't a hot topic anywhere outside of the US that I have been. Global Warming is accepted elsewhere, and what to do about it is the issue. What keeps people in the US from listening to the scientists is special interest money from large corporations - including oil. They fund most of the research that finds either no global warming or that it has no link with human activity. Independent research around the world shows the opposite. The sad thing is that people tend to focus on this Global Warming debate as if it is the sole environmental concern that we have, and it isn't. Loss of habitat, deforestation, atmospheric polution, and poluted water sources still exist and need to be dealt with.

My credentials: BS in Earth and Atmospheric Sciences, MS work in Meteorology, retired Weather Officer from the USAF National Guard, worked on NASA Global Weather model in 1970's. First fact - Climate changes. It has been noted that the Vikings first explored America about 1000 years ago when Greenland actually had Green coasts. Between then and now was a "little ice age" in the 1300-1600's. Second fact - The observation of atmospheric temperatures was limited to sporatic measurement at the earth's surface until the 1950's. Even now,upper air observations are sparse and have limited reliability. So if we've only been measuring temperature for a few years, and if climate changes naturally anyway, what does this mean? Maybe something, maybe not. Is man's industrial revolution affecting the climate? Yes. Is man's effect on the climate significant when comparted to natural changes in climate? Maybe. Are we headed down the road to certain destruction. Probably. But not from man's effects on the Earth's climate.

Thing is that the world has long-term heating/cooling cycles, this is proven. It is also proven that green-house gasses are making this heating trend we're in more intense. However, these same gasses also block heat, and so it's quite feasable that we'll see extreme cooling within the next 50-100 years as well, no one is sure yet.

1.) Many, many climatologists are saying the exact opposite -- that the planet has gone through regular periods of warming AND cooling, for its entire history. But those aren't the kind of reports that sell newspapers and magazines, so you don't generally hear of them. 2.) The "global warming" trend that people are up in arms about is an average of a ONE DEGREE CELSIUS increase over a period of a CENTURY. 3.) The last time the Earth was this warm was in the Middle Ages -- and we all know how many people were driving SUV's back THEN... 4.) There have been periods in the Earth's history when the oceans were an average of about 20 degrees warmer than they are now, and when there were NO permanent polar ice caps -- and life managed to survive just fine. These facts all beg the questions: Exactly what IS the "correct" temperature for the Earth; and how much control could we have over the planet's temperature, even if we wanted to?

Global warming is not caused primarily by humans. By now, we know that there are many factors involved with the ancient cycle of warming and cooling on this planet. But it is happening. The planet is on a warming trend and there is little doubt left that human activity since the industrial revolution has accelerated the trend. While so many people like to roll in the mud over whether it's the fault of humans or not, but fact is that it's in our best interests to make what changes we can while we can. Just as the planet is pretty much on schedule to warm again, we are well past due for a mass extinction, and man is near the top of the list. Whether or not humans are to blame, we stand to be severely impacted by global weather changes.

On the one hand, there is evidence attesting to the fact that the earth has undergone natural climate changes in the past. However, that very same evidence gives us a point of reference to see just how much more severe it is this time around. As for whether or not it's imminently lethal to the human race, does it really matter that much whether the planet becomes ununihabitable within our lifetime as opposed to that of our children or grandchildren? If every generation used the excuse that the damage they were doing wasn't imminently lethal, the first generation to give a shit would be too late to have much impact. Also, whether or not global warming in particular is an imminent threat and caused by human activity, there is no denying that the same human activities blamed for global warming are harming the environment in numerous other ways, and even if they weren't imminently lethal to the human race, they'd still be lethal to many, many other forms of life on the planet.

i dont know abut humans causing global warming but we do cause global dimming (polution in the air blocking out sunlight) if we stopped pumping out all the polutants that we do global dimming would reverse and the world would be alot hotter than it is right now. basically what is happening to our climate (global warming) is being slowed by humans blocking out the full potential of the suns rays.