what causes global warming, planting more trees, burning fossil fuels, which gas is the main cause of the greenhouse effect, oxygen, carbon dioxyde, what can we recycle, plastic bottles, food waste, what do we call the cutting down of forests, deforestation , pollution, which of these helps to protect nature, using public transport, burning plastic, what should we do with old paper, recycle it , burn it, which energy sourceis renewable, coal, solar energy, what is the biggest source of ocean pollution, sand, salt.

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