When Mark Ruffalo isn't busy starring on the big screen, he has an environmental cause that he continuously fights for: Clean water and clean energy. In fact, he works so tirelessly, that on April 16, he was presented with the Big Fish Award for environmental work at the annual Riverkeeper's Fisherman's Ball. The actor is the co-founder of Water Defense, a charity organization that aims to create a world where the water the safe and is powered by clean and sustainable energy. He even tweeted on April 22 to promote awareness of Earth Day: "Happy #earthday! Ban the use of neonicotinoid pesticides before they devastate bee populations in the USA."