By Simon Jessop LONDON (Reuters) – A group of European development banks plan to double its funding for global efforts to stop plastic waste from polluting the world’s oceans to 4 billion euros ($4.6 billion). The Clean Oceans Initiative, led by the French and German development banks and the European Investment Bank is the largest such grouping targeting plastic pollution of the sea. Around 8 million tonnes of plastic waste enters the oceans every year, most of it discarded on land or washed into rivers, the group said on Friday, threatening the marine environment and communities that rely on…