Why in ancient times did man not damage nature?

In ancient times, the population density on the planet was extremely low. If now there are about 7 billion people, in 1900 there were about 1.5 billion, then it is unlikely that in antiquity more than 50 million people lived on the entire planet.

Second, the use of technology. In ancient times, there was no industry, exhaust gases and other man-made pollution. People only burned fires and hunted animals.

That is why in ancient times there was no need for reserves, national parks, and nature conservation measures.