Causes of Global Warming

     I wanted to look at the causes of global warming because people are talking about it all the time.  I wanted to actually take a little look at it to see the relationships between what causes global warming and what the effects are/are going to be now and in the future. 
     Scientists have studied global warming for many years now and they have looked at tons of different natural cycles and events that can influence climate change and they all seem to agree upon one thing; that those natural cycles do not explain global warming by themselves.  All scientists agree that you can't attempt to describe climate change without looking at greenhouse gases.  Most greenhouse gases come from the combustion of fossil fuels in cars along with factories and electricity production.  The one gas most responsible for global warming though is Co2 followed by methane from landfills, nitrous oxide from fertilizers, regrigeration gases, and than the loss of forests that would normally store Co2.  What essentially happens is that you have all these gases that are stuck inside our layer and they are trapping all the heat that is trying to exit earth, causing the earth to be much warmer.  Since 1990, yarly emmissions have gone up 20 percent at 6 billion metric tons. 

http://environment.nationalgeographic.com/environment/global-warming/gw-causes