pollution - the process of making our planet dirty and useless for living, ecology - the science that studies the relations of plants, animals and people to each other and their environment , nuclear testing - the experiments with nuclear weapons, Earth - our planet, tropical forest - a thick forest in tropical parts of the world, energy - it can come from the power of wind, sun, cars - they give off gases (fumes) which pollute the air, endangered animals - we should protect them, global warming - the cause of the Arctic ice melting, growing population - many people are born , save - keep our planet for the future generations , Covid-19 pandemic - the problem of the whole mankind nowadays,

ecology

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