Tariq Fancy was BlackRock’s sustainable investing CIO between 2018 and 2019, and had a unique vantage point into the world’s largest asset manager's approach to ESG investing.

However, he has gone on to become one of the ESG sector’s fiercest critics. Last month Fancy published an explosive three-part essay via online publishing platform Medium, in which he likened the booming sustainable investment sector to “selling the public a wheatgrass placebo as a solution to the onset of cancer.”