Bollywood stars including Aishwarya Rai are the latest celebrities to join the green movement, after teaming up for a world tour focusing on climate change.

Rai will join Amitabh Bachchan and Shilpa Shetty to perform on eight dates of the forthcoming Unforgettable Tour, which will highlight the dangers of global warming.

The three-hour event will feature dance routines choreographed by Shiamak Davar.

The first concert kicks off in Toronto, Canada on 18 July (08) and culminates on 24 August (08) at London's O2 Arena.