Unless we use more renewable energy, - there will be no more coal, oil or gas in the future , If people use more solar energy, - there will be less pollution, Unless you study hard for an exam, - you won't pass, What will you do, - if the weather is nice this weekend?, If you fail your exam, - what will you do?, If pollution increases, - more plants and animals will die, Unless more people cycle to work, - pollution will increase, If there are more places for teenagers to go, - the won't cause problems in town centers, If we don't drop litter, - we will have cleaner streets, If temperatures continue to rise, - the ice at the poles will melt, The problem of climate change won't go away, - unless we do something about the causes,

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