One idea to reverse climate change is to feed algae iron in the oceans, causing them to grow rapidly, sucking carbon dioxide out of the air.
Problem is, when they tried it, the algae got eaten.
Although I don't quite follow why that's a problem. If the algae become part of their predators' flesh, the carbon is still sequestered. I suppose most of the algae carbon ends up being exhaled in the animals' breath, though. Which is a problem. One you think they would have foreseen.
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