New Delhi: Prime Minister NarendraModi on Sunday said a massive campaign of waste management will be launched by the Centre and state governments on the occasion of World Environment Day. Addressing the nation through Mann Ki Baat programme on All India Radio, Modi said litter bins will be made available to collect solid and liquid waste in 4000 towns of the country on 5th of June. Modi said two types of waste bins will be available - one green and the other blue.