The chart on the left represents the amount of CO2 produced. As you can see, it was pretty stable back in the 1700's and going into the 1800's. However, around 1950 it began to significantly rise. Well what happened in 1950? Actually beginning in 1900, the amount of fossil fuels that people were burning had began to double. So by 1950, it really started to show, however, people weren't worried about how much CO2 was being released. Over the years we have increased the use of technology and power so therefore we have hugely increased the amount of fossil fuels.
The chart to the right represents the temperature. Obviously, the more CO2 that is being released, the warmer it is getting. However, this is when it comes controversial because the increase in CO2 could just be a coincidence. I personally don't think it is just a coincidence. The charts and graphs are so similar when comparing it is very hard to not agree with the data.
http://www.ways-to-stop-global-warming.com/global-warming-charts.html
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