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Pollution is the ____________________ of natural environment by external substances introduced directly or indirectly . ____________________ health , ecosystem quality and aquatic and terrestrial biodiversity may be affected and altered permanently by ____________________ .

____________________ occurs when ____________________ can not get rid of ____________________ introduced into the ____________________ . The critical threshold of its ability to naturally eliminate substances is compromised and the ____________________ of the ____________________ is broken .

Air PollutionThe sources of pollution are ____________________ . The identification of these different ____________________ and their ____________________ on ecosystems is ____________________ . They can come from ____________________ ____________________ or the result of ____________________ activity , such as ____________________ spills , ____________________ spills , ____________________ accidents . . . These can have terrible ____________________ on people and the ____________________ where they live : ____________________ of the biodiversity , increased ____________________ of the human and ____________________ species , destruction of natural ____________________ , damage caused to the quality of soil , water and air . . .

Preventing pollution and protecting the ____________________ necessitate the application of the ____________________ of sustainable development . we have to consider to satisfy the needs of today without compromising the ability of future ____________________ to meet their needs . This means that we should remedy existing pollution , but also ____________________ and ____________________ future pollution ____________________ in order to protect the environment and public health . Any ____________________ damage must be ____________________ by ____________________ , and ____________________ should pay ____________________ for the ____________________ caused to the ____________________ .