In July 2012, George and collaborators in the Haida Salmon Restoration Corporation conducted an iron fertilization experiment spreading 100 tonnes of iron sulphate into the Pacific Ocean from a fishing boat in an eddy 200 nautical miles west of the islands of Haida Gwaii. George claimed this resulted in increased growth of phytoplankton over 10,000 square miles. Some critics assert George's actions were illegal while others have argued that they were not. However, this iron fertilization may have violated the United Nations Convention on Biological Diversity (CBD) and the London Convention on the Dumping of Wastes at Sea which contain moratoriums on geoengineering experiments. Parties to the London Convention and London Protocol expressed 'grave concerns' about this experiment. Search warrants were executed by Environment Canada's enforcement branch to investigate Russ George's office concerning the iron enrichment he performed in 2012 off the coast of British Columbia.