Part one of term paper
1) The amount of carbon dioxide in our atmosphere has been increasing rapidly over the last few decades and continues to do so. 2) Historically, the trends in increase of carbon dioxide started in the late 1700's. This was the approximate time of the Industrial Revolution. At this time, the carbon dioxide concentration was around 270 ppm (p ...

Part two of term paper
... This is done by examining tiny bubbles of air in the ice core at different levels below the present ice surface. The deeper layers in the ice core correspond to times in the more distant past. The air bubbles can be analysed for the relative abundance of carbon dioxide to estimate atmospheric carbon dioxide levels at times extending back 160 000 years. Through the ice sheet, we know that 160 000 years ago, carbon dioxide concentrations were about 180 ppm and have presently exceeded 350 ppm. ...