If we burn fossil fuels, which release carbon dioxide and warm the atmosphere, as the oceans warm they will release more carbon dioxide, which warms the atmosphere. This is an example of feedback. If the increased atmospheric carbon dioxide causes increased plant growth which removes carbon dioxide and cools the atmosphere, this is an example of feedback.

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they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.