More than 20 green groups are boycotting this week's Climate Week activities, blaming the "cynical" sponsorship by Royal Bank of Scotland (RBS), which provides finance to the coal industry.  Taxpayer-owned RBS provided finance worth nearly $8bn (?4.9bn) to the world's biggest coal mining and coal-fired electricity generators over the past three years, more than any other UK bank, according to a report to be published this morning by campaign group Platform.  a string of campaign groups including the Centre for alternative Technology, artist Project Earth and Platform itself have withdrawn from Climate Week as a result, accusing the financial institution of "greenwash" when it is bankrolling production of the most carbon-intensive fossil fuel.  Other groups are planning to focus on RBS's lending activities in the fossil fuel sector as part of their Climate Week activities. The central charge is one of hypocrisy. "For RBS to cynically appropriate the language around climate change action as a means of detracting attention and criticism from the promotion of climate-destructive industries and practices is totally reprehensible," Platform's Mel Evans, one of the report's authors, said. "You can't