Tropical rainforest
Settlers can get into the rainforests because modern machines have opened roads deep into the jungle. The roads are usually built by businesses who want to cut down trees or dig up minerals in the forest. Governments build other roads for trade and to allow settlers into the forest. Poor people come into the forest by the thousands on the roads and take land to raise food. They burn off the trees and plants to make a field. Then they plant crops for food and to sell. All around them other farmers do the same, so there is no forest left to grow back.