International Herald Tribune: The sustainable investment firm run by Al Gore, the former U.S. vice-president, is about to be closed to new investors, having raised close to its $5 billion target. Generation Investment Management will probably restrict inflows into its main Global Equity Fund next month, Gore and David Blood, co-founder of the company, said at a news conference Tuesday. Blood said the firm could not manage more than $5 billion in assets. While assets under management did not yet correspond …