Здесь приведен ответ к восьмому упражнению по теме ЭКОЛОГИЯ НА АНГЛИЙСКОМ.
The air quality in many of the world’s largest cities is so poor that we have seen an enormous increase in chest and lung illnesses such as asthma. These cities are heavily polluted and some are permanently covered by a cloud of pollution. Unless we begin to take the problems more seriously and start to do something about them, many of our biggest cities, particularly in the developing world, will become uninhabitable.