How do people protect nature?

People realized that nature needs to be protected and protected. Therefore, they converted most of the factories and factories so that these enterprises pollute the environment as little as possible.
People began to plant new forests in place of the felled ones. Rare plants and animals are listed in special Red Data Books, now it is impossible to collect these plants, it is forbidden to hunt these animals. In many countries, specially protected areas have been created: national parks and reserves.