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By Mark Harris

Inaki Relanzon/naturepl.com

SOME of the world’s richest people are funding research that could use the oceans to combat climate change. The idea is welcomed by some researchers, but others caution that there is a lack of international agreement about geoengineering the planet in such ways. Should billionaires be able to start tinkering with the climate without asking the rest of us?

Last September, scientists, policy-makers and funders met in California to discuss an idea to use an emerging suite of technologies known as ocean alkalinity enhancement (OAE). This aims to reduce …

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