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Forests And Oceans As Carbon Sinks Beginning of 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 .... Middle of Paper .... 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. 5) There are mainly 3 major sources of carbon dioxide presently and historically. They are industrial activity, land use change and cement plants. The carbon dioxide from industrial activity mainly comes from fossil fuel burning and is by far the most abundant of sources. The carbon dioxide from land use change comes mostly from deforestation which occurs mostly in Brazil, Indonesia a .... 1364 words | 5 pages Subscription Length Price Join 30 days membership (recurring) $19.95 90 days membership (recurring) $39.95 180 days membership (non-recurring) $69.95