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 What is Climate change? On Earth, human activities are changing the natural greenhouse. Over the last century the burning of fossil fuels like coal and oil has increased the concentration of atmospheric carbon dioxide (CO 2 ). This happens because the coal or oil burning process combines carbon with oxygen in the air to make CO 2 . To a lesser extent, the clearing of land for agriculture, industry, and other human activities has increased concentrations of greenhouse gases. The Role of Human Activity In its Fifth Assessment Report, the Intergovernmental Panel on Climate Change, a group of 1,300 independent scientific experts from countries all over the world under the auspices of the United Nations, concluded there's a more than 95 percent probability that human activities over the past 50 years have warmed our planet. Duties Some actions that we can do are: We must plant more trees, they will grow and purify more oxigen. We should use less vehicles, we´re going to mess the ozono ...