In the summer of 2012, a small group of the Haida people, a native community in Canada, had a problem. The salmon they rely on were disappearing. So the Haida took matters into their own hands.
They partnered with an American businessman, drew up plans and then took a boat full of iron dust into the waters off their home island and put the dust in the ocean.
When they spread the iron dust, it created a big algae bloom. They hoped the algae would soak up carbon dioxide and bring back the fish.