Chico Mendes (Fransisco Mendes Filho) was a Brazilian rubber tapper, trade union leader, and environmentalist. He became a vocal advocate for the preservation of the Amazon rainforest and the rights of the rubber tappers who lived there, campaigning against deforestation and advocating for extractive reserves. He was known as 'Amazon Gandhi' for his non-violent resistance tactics in his environmental activism. His work was in environmental and human rights activism related to conservation, not specifically the 'energy field'.