The South African government is considering a ban on plastic bags as a way to help clean up its littered streets and landscapes, Mohammed Valli Moosa, the nation’s new environment minister, said yesterday. He also said the government may impose a compulsory returnable deposit on all bottles to ensure they aren’t tossed into the street or thrown away. Valli Moosa stressed that cleaning up the environment goes hand-in-hand with promoting the country as a tourist destination.