evidence evidence evidence evidence evidence 20 million indigenous peoples evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence 20 million indigenous peoples people in the Amazo evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence Amazon People evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence hundreds of indigenous groups evidence evidence evidence evidence evidence evidence evidence evidence Amazon People evidence evidence evidence evidence evidence evidence evidence evidence evidence Amazon People evidence evidence evidence evidence evidence evidence http://rainforests.mongabay.com/amazon/amazon_people.html evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence evidence