What is one of the more defining characteristics of the modern era

Pollution can be stated as one of the more defining characteristics of the modern era.

Explanation:

In the modern era, during the industrial revolution pollution has been increased at a great scale. This is mainly due to the factors such as charcoal burning, gas emission, etc.,

Health impacts due to air pollution has also increased. For instance the mortality rate in London during 1840 was 25 per 100,000 and it has increased to 300 per 100,000 during 1890.

During the later period, the great smog of 1952 took the lives of more than 4000 people.

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