Socially responsible investment is a $12 trillion industry. Does it make the world better? Probably not. “Impact investing” is built on a simple idea: If you’re going to invest your money, you’ll want to invest it in companies that are doing work that you believe in. Easier access to capital lets companies do more — expand into new areas, build new products, take promising bets. Your investment would allow a company you believe in to do all those things.