Essay: Every country in the world has problems with pollution and damage to the environment

One of the most important problems in the world is the pollution and damage to the environment.
To solve this problem is difficult and the government around the world work to try to stop that. [It is difficult to solve this problem, and governments around the work try to do so]
The principal cause of the pollution in the air is the transport. In the big cities like London, Madrid or Beijing have affected for the pollution. [unclear meaning - perhaps - In big cities like London, Madrid or Beijing, transport causes a lot of pollution] 
The people should use alternative forms of transport, for example, bicycles, electric cars or public transport.

Another big problem is the pollution in the rivers and seas. The Government has to should control the big factories and protect the rivers.
And the citizens must be recycled in their houses [And people should recycle at home]. And become aware of the pollution problems and try to put solution create solutions.