ecology, the relationship between living things and the environment, or the scientific study of this, air pollution, damage caused to air by harmful substances or waste, water pollution, damage caused to water by harmful substances or waste, natural resources, things such as ​minerals, ​forests, ​coal, etc. that ​exist in a ​place and can be used by ​people, harmful, causing or likely to cause harm, chemical, relating to chemistry or chemicals, litter, pieces of paper and other waste that are left in public places, plastic, a light, artificial substance that can be made into different shapes when it is soft and is used in a lot of different ways, species, a group of plants or animals which share similar characteristics, recycle, to put used paper, glass, plastic, etc through a process so that it can be used again, emissions, an amount of gas, heat, light, etc that is sent out.

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