2) The world has already been heating up for 30 years, with global

3) The main greenhouse gases caused by people’s activities are carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), chlorofluorocarbons (CFCs) and ozone. Water vapour is also an important greenhouse gas.
4) About 64% of the warming effect of greenhouse gas increases over the last 200 years is due to carbon dioxide, produced mainly because of human activities through using fossil fuels, deforestation and agriculture.
5) Records show that 11 of the last dozen years were among the 12 warmest on record worldwide – and it’s getting warmer.
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