charities and is brand ambassador for NDTV Greenathon, an initiative to support eco-friendliness and provide solar power to rural villages without electricity supplies. She appeared with children in an animated video to support the cause, and removed rubbish from the banks of the Yamuna river in Agra to increase awareness of environmental issues. During the third and fourth editions of Greenathon, She adopted up to seven villages to provide with a regular supply of electricity. She adopted a tigress in 2011 and a lioness in 2012 at the Birsa biological park, paying for both animals upkeep for a year. To promote organ donation, Chopra pledged to donate her own organs after death and was co-keynote speaker at the University of Pittsburgh Medical Center's Bollywood-themed 20th-anniversary celebration of its liver-transplant programme in 2012. She donated to Nanavati hospital to build a cancer ward. The ward, which is named after her late father, was inaugurated by her in 2013. The same year, she provided voice-over in English and Hindi for the documentary film Girl Rising for the organisation of the same name. She was invited as one of the speakers alongside Gordon Brown, Steve Wozniak, Bill Clinton, and Charlie Baker for the 50th anniversary of the World Leaders Conference at the Hynes Convention Center, Boston. She spoke about women empowerment through education, discussing inequality and the challenges of education for women, and received a standing ovation for her speech. Chopra also lent her voice to a music video of John Lennon's "Imagine". The video featuring her along with other singers, including Katy Perry, and The Black Eyed Peas was created as part of a global campaign by UNICEF to celebrate the 25th anniversary of the Convention on the Rights of the Child. Indian prime minister Narendra Modi selected Chopra as one of his nine nominees called "Navratna" in 2014 for the Swachh Bharat Abhiyan, a national cleanliness campaign by the Government of India. She lent her support to the campaign by working as a sanitation worker for a day, cleaning and rehabilitating a garbage-laden neighbourhood in Mumbai, and urged people to maintain the cleanliness. In 2015, she voiced People for the Ethical Treatment of Animals (PETA's) life-size robotic elephant named "Ellie", who visited schools across the United States and Europe to educate kids about elephants and captivity, and to urge people to boycott circuses. Chopra was appointed as the global UNICEF Goodwill