ecology - the relationship between living things and the environment, or the scientific study of this, concern - to involve someone or be important to them, 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, technological - relating to, or involving technology, 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, glass - a hard, transparent substance that objects such as windows and bottles are made of acid rain , 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,

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