Guardian: Bollywood’s biggest stars have become the latest celebrities to join the green movement, with a world tour to highlight climate change. Names more recognisable in the Indian sub-continent than Brad Pitt and Nicole Kidman will perform eight concerts, culminating in London next month with the biggest indoor Bollywood event ever to be hosted in Britain. Amitabh Bachchan, Aishwarya Rai Bachchan and Shilpa Shetty, who became embroiled in a race row in 2007 while appearing on …