Mumbai, May 29 (ANI): Bollywood beauty Zarine Khan came out in support of couturier Amy Billimoria's unique initiative 'Earth 21'; a line of Eco-friendly collection. Donning a golden-green dress from the eco-friendly collection Zarine looked as gorgeous as ever. Speaking on the occasion the actress said that it's our duty to take care of Earth. The core essence of 'Earth 21' lies in the idea that with every outfit sold in this line Amy will donate a tree to mother earth, now that's indeed a great step on your part Amy.