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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