Earth Day: Meet the original eco warriors protecting the planet
Indigenous people account for less than 5% of the world's population - but they support or protect 80% of the planet's biodiversity.
They are often the most vulnerable to climate change, but have developed systems built on thousands of years of land management, sustainability, and climate adaption.
Dr Koko Warner from the United Nations climate change secretariat says their participation in fighting global warming is vital.
"I am really hoping for a future scenario where by combining and blending and growing our value systems together, human beings will develop new practices that can be a positive force in nature," she said.
But where did this ancient knowledge come from and do these practices really work? As the world marks the 50th anniversary of Earth Day, here are five stories about climate pioneers who are digging deep into their history.
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