While it is true the greenhouse effect (global warming) has always been here, the amount of greenhouse gases has never been anywhere near as high as it is today. Humans consist the majority of the raise in this problem. The huge population boom in only several generations is a large part of the reason why. More people means more recourses needed. More recourses needed means more recourses used. Forests get chopped down, by that happening we gain more CO2 because trees use CO2. Forest fires, yes majority of forest fires (let me US as an example) are human caused, mostly accidental or indirectly. You see forest fires normally happen naturally to clear brush and logs and such out of the way (the flammable stuff), but humans don't do it. Yes, we do controlled burns but they often are not enough and in a lot of places the brush is bad enough that they would not be able to control the fire, or a house is nearby and they don't want to risk it. Seeing as such we have been having a lot of bad fires which in turn add more CO2. Fossil fuels is another problem, maybe the most difficult to cure problem. You see alternatives each as someone has previously said also require energy to make. The thing Bush proposed (sorry I forgot what exactly it was, and no I'm not insulting Bush) about corn something doesn't really work. It requires us to use soil and materials to plant corn, then corn doesn't really replenish the nutrients in the soil so we have to use more things each time. Windmills have downsides too. Every time a windmill spins it creates a little vortex of air being sucked in and such. Every time this happens when birds fly by they get sucked and well, die. The problem with this issue is that there is no real clear solution on fossil fuels. Moving on to water vapor. Water vapor is another of 4 greenhouse gases. Now we don't directly put most of the water vapor in the troposphere, but we do indirectly. You see by the CO2 alone warms the air, which in turn gets more water vapor. Warm air holds more water vapor then cold. More water vapor in the air, the more that goes up to the troposphere. CH4, we don't really do this one that much, it's as I've heard someone say "cows pooting" and such. The fourth gas is once again, the tailpipe of your car. Wewt first post /flex :-w