Authorities in India's western state of Maharashtra have banned the sale and use of plastic bags, saying they were the main cause of blocked drains during recent floods. State's chief minister Vilasrao Deshmukh said the ban will take effect in one month so that residents have a chance to file objections and suggestions. He said the ban was prompted by the careless and irresponsible littering of plastic bags, which blocked sewage and drainage systems during record monsoon rains in July. Flooding and landslides killed more than 1,000 people in the state. Mr. Deshmukh added that plastic manufacturers will be allowed to continue making plastic bags as long as they are sold outside the state. Environmentalists have welcomed the move, but plastic manufacturers said they would oppose it.