Rain forests once covered almost all of Central America but many of these areas were cleared for cattle ranching and plantations. Currently the Amazon jungle is the worlds largest tropical rainforest.
When people cut down the rain forest to build houses, make furniture and paper they hurt the planet. They mine the land for oil and gold. People burn the rain forests to clear the land. They hurt the rain forest to make money for themselves.
When people use less paper they save the rain forest. When they use less oil and gasoline, they save the rain forest. When they eat less red meat they save the rain forest because we don't need the land to raise the cattle. Many groups raise money for awareness and to "re-plant" the rain forests.