Major US financial firms are helping fund environmental destruction and indigenous rights abuses in the Amazon with billions of dollars in investments in questionable companies, according to a report published Tuesday. Six top firms -- BlackRock, Citigroup, JPMorgan Chase, Vanguard, Bank of America and Dimensional Fund Advisors -- have invested more than $18 billion over the past three years in mining, agribusiness and energy companies involved in a "series of abuses" in the world's biggest rainforest, found the report by the environmental group Amazon Watch and the Association of Brazil's Indigenous Peoples.