We burn fossil fuels in - our cars., Oil, gas and coal - are fossil fuels., Cars emit - carbon-dioxide., Our houses run - on electricity., Electric power stations pollute - the air with carbon-dioxide., Holidays are getting - cheaper., People more often go - on holiday by plane., Aeroplanes pollute the air - more than cars., Because of global warming - the sea level rises., Some scientists think that there are more hurricanes - because of the rising sea-level.,

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