greenhouse gas, carbon dioxide, deforestation, cutting down forests, oxygen, gas we need for breathing, global warming, increase in planet's temperature, ice caps, thick layers of ice, pollution , harmful materials in the environment, recycle, convert waste into reusable material, reduce, cut down on the use of something, reuse, use something again/more than once, a tonne, a thousand kilos, fossil fuels, coal, gas, oil.

ecology

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