^you realize WE (as humans) cause global warming.. NOT nature. I have no idea how you got that idea. The Earth didn't go; "Oh yah, I felt like trapping Carbon Dioxide in my atmosphere so I can slowly warm up and eventually doom everything living on me, YAY!!!11!!1one!". Its us.... with mass populations causing so much CO2 that gets stuck in our atmosphere forces the sunlight (as well as the heat that goes with it) in the atmosphere, slowly increasing the temperature of Earth's surface.
Anyways, I use computers a lot, TVs all that stuff. However, I don't drive (cuz' I'm only 15) but I don't plan on getting my liscense right after my birthday either. I prefer playing sports and stuff, so if I need to get somewhere, I'll run or bike there. If it is too far away, then I'll take a car.
Also, if you want to reduce CO2 emissions from your car.. take out the catalyst in it. xP I suggest you don't though, SERIOUSLY. If it wasn't in there, the car would produce a lot of carbon monoxide, therefor killing you. So, yah. D=