Channeling 2 percent, or $1.3 trillion, of global gross domestic product into greening sectors such as construction, energy and fishing could start a move toward a low-carbon world, a report launched on Monday said. The investment would expand the global economy at the same rate, if not higher, as under present economic policies, said the report by the U.N. Environment Program (UNEP). "Investing 2 per cent of global GDP into 10 key sectors can kick-start a transition toward a low-carbon world," the Nairobi-based agency said in a statement.