Jane Fonda, Leonardo DiCaprio and more celebrities have made it their mission to make the world a more eco-friendly place.The Oscar winner and longtime activist has made headlines for her involvement in the Fire Drill Friday protests, kickstarted by Greta Thunberg to raise awareness about the dangers of climate change. “All of these young people striking on Friday, saying, ‘Come on, adults, where are you? We didn’t cause this, but it’s our future that’s at stake.