ecological - relating to ecology or the environment (adj), environment - the air, water, and land in or on which people, animals, and plants live (n), recycling - the process of collecting and changing old paper, glass, plastic, etc. so that it can be used again(n), environmentalist - a person who is interested in or studies the environment and who tries to protect it from being damaged by human activities (n), reforestation - the act of planting trees on an area of land that has become empty or spoiled (n), pedestrianize - to make an area into one where vehicles are not allowed to go (v), protect - to keep someone or something safe from injury, damage, or loss (v), petrol - a liquid obtained from petroleum, used especially as a fuel for cars and other vehicles (n), acid rain - rain that contains large amounts of harmful chemicals (n), desertification - the process by which land changes into desert (v), pollutant - a substance that pollutes (n), isotope - a form of an atom that has a different atomic weight from other forms of the same atom but the same chemical structure (n), contamination - the process of making something dirty or poisonous (n), clog - to (cause something to) become blocked or filled so that movement or activity is difficult (v), overflow - it flows over the edges of a container (v),

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