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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