Hello dear friend, you have mentioned great points. As nature has potential to cure any types of disease. That's why, in ancient time without the use of much technology the people were able to treat patients. In our culture, the doctors of pre era were called Veead. They had immense knowledge about the nature habit and its huge applications. They knew how to extract and how to apply it.
All over the world, people were dependent mainly on nature for medicines, foods and land . We should respect and try to protect it.