India, a country that ranks third from the bottom in the global Environmental Performance Index, is hosting the World Environment Day this year, on June 5. The theme for this year is 'Beat Plastic Pollution', which urges governments, industry, communities and individuals to come together and explore sustainable alternatives and urgently reduce the production and excessive use of single-use plastic that is polluting our oceans, damaging marine life and threatening human health. When it comes to saving the environment, these Bollywood celebrities believe in working for the cause, and not necessarily for the applause. From harvesting rainwater to building India's first elephant village, they have been quietly contributing to make the world a better, cleaner and greener place. We are remembering the work of these celebrities on World Environment Day because their efforts extend beyond smiling for the cameras or posing for campaigns. Let's take a leaf from their book.