Global symbiotic relationship

Are humans part of a large-scale symbiotic relationship with nearly all organisms? We depend on trees to give us oxygen, we depend on animals for food, work and dairy products, we depend on fungi getting rid of all our biotic waste. So we must give back. Animals depend on us to maintain populations of predators and prey in general, trees need us as the most numerous being to provide CO2. We must find our place in the global ecosystem. Protect all biomes and the organisms within!