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How you can reduce CO2 levels

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Daily human activities increase atmospheric carbon dioxide levels and are feared to speed up the rate of global warming. The average family produces 3 tonnes of CO2 a year, but there are several measures (in addition to reducing individual energy consumption) that environmentalists say offset this so-called 'carbon footprint'.

Planting trees Trees may help reduce global warming by absorbing carbon dioxide and producing oxygen. Some organisations will plant trees on your behalf.

Buy carbon credits A carbon credit is registered by any activity which keeps 1 tonne of carbon dioxide out of the atmosphere for a 100-year period. Various companies will undertake such activities on your behalf, for about $140.

Investment Options include renewable energy sources, biomass fuels, waste-to-energy products, recycling and fuel-efficient vehicles.

Donations Not just the cash kind - for instance, some groups advocate donating energy-efficient light bulbs to developing countries to counteract your own carbon emissions.

Source: carbonplanet.com, carbonfootprint.com

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