So The Economist has looked at the global listed firms that are most held by the biggest 100 or so clean-energy investment funds. Global flows into ESG funds topped $178 billion in the first quarter of this year, up from $38 billion in the same quarter last year, according to Morningstar, a research firm. Nathan Anderson of Hindenburg Research, an investment firm, says fraud has become “pervasive” as money has flowed into green firms.