A promising natural technique to remove CO2 could backfire

  • Tens of millions of dollars have been invested in growing seaweed to absorb carbon dioxide and slow climate change.
  • But due to unwanted side effects, this technique could fail to significantly decrease the CO2 in the atmosphere, and it might even increase it.
  • Carbon dioxide removal (CDR) will be needed to meet the Paris Agreement goal of limiting global warming to 2°C, according to the UN, and many have hoped seaweed could be a cheap way to do that.

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