Bollywood celebrities like Gulzar, Farhan Akhtar and Abhay Deol have been tagged 'green hearts' after they signed up for British aid agency Oxfam India's message on climate change Friday at the 11th annual Osian's Cinefan Film Festival of Asian and Arab Cinema here.

The "green hearts" will be voicing their opinions and fighting for various causes of climate change, said a press release from Oxfam India.

The agency has set up a green corner with a green carpet to promote causes associated with climate change at the film festival. It has been endorsed by a lot of other celebrities like Anurag Kashyap, Zoya Akhtar, Imtiaz Ali, Vishal Bhardwaj, Amol Gupte, Rajeev Khandelwal, et al.

Bollywood actor Rahul Bose was the first Indian to become the global ambassador of the international NGO. In 2007, he joined the elite company of actresses Scarlett Johansson, Helen Mirren and singer Annie Lennox who are also associated with Oxfam's green cause.