World Environmental Problems
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Rising sea levels, melting ice caps and coral reef bleaching are caused by g_____ w________.
global warming
Travelling by air, driving a car or using coal-generated electricity will make your c______ f_______ bigger.
carbon footprint
The world is o____p________ . There're currently 7 billion people living in our planet and numbers are estimated to increase to 8 billion by 2025.
overpopulated
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