amount of carbon dioxide in the atmosphere, because new trees are not allowed to replace those removed. The most important way in which we add to the amount of carbon dioxide in the atmosphere is by burning fossil fuels . Another important contributor is the manufacture of cement . Climate scientists say that overall we have increased the concentration of carbon dioxide in the atmosphere by around 35 per cent since the beginning of the Industrial Age. The Carbon/CO2 on earth is part of a natural cycle which balances the CO2 in the atmosphere with the carbon locked in the rocks as limestone, and hydrocarbons. In general over the totality of geologic time the amount of CO2 in the atmosphere has fallen as a result of biological processes. In recent times human activity has been responsible for releasing a large quantity of fossil Carbon (oil, gas and coal) as CO2 into the atmosphere. While much of this has been buffered by the CO2 dissolving in the oceans, there has also been a marked increase in CO2 percentage in the atmosphere since the Industrial Revolution. The burning of fossil fuels is a primary source of increased atmospheric carbon dioxide. Motor vehicle exhaust and the burning of fuel oil in ships and factories or power plants puts lots of CO 2 into the air. We also burn a lot of coal worldwide, and this also ups CO 2 output by people. Additionally, the burning of wild lands (either by accident or on