Controversial US businessman’s iron fertilisation off west coast of Canada contravenes two UN conventions.

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A controversial American businessman dumped around 100 tonnes of iron sulphate into the Pacific Ocean as part of a geoengineering scheme off the west coast of Canada in July, a Guardian investigation can reveal.

Lawyers, environmentalists and civil society groups are calling it a “blatant violation” of two international moratoria and the news is likely to spark outrage at a United Nations environmental summit taking place in India this week.

Satellite images appear to confirm the claim by Californian Russ George that the iron has spawned an artificial plankton bloom as large as 10,000 square kilometres. The intention is for the plankton to absorb carbon dioxide and then sink to the ocean bed – a geoengineering technique known as ocean fertilisation that he hopes will net lucrative carbon credits.

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