Why are plants and animals disappearing in nature? How do people contribute to nature conservation?

Often this happens through the fault of man, because many animals were exterminated for food or for clothing. You probably noticed what kind of fur coats the ladies wear, but one such fur coat took a lot of animals. It is not surprising that they will soon disappear from our nature. Man does not protect plants at all, we pollute the air, and because of this, everything perishes, trees are completely cut down for our needs. But the climate also affects plants, recently in many regions it has changed, and plants are not used to it and therefore die.
People also protect nature, there are many reserves for endangered species of animals and plants, where they can breathe deeply and not be afraid that they will be killed.