When #GretaThunberg started going to the Swedish Parliament to protest the government's inaction over #ClimateChange, she probably worried that nobody would support her. Leading is lonely. It always requires you to step out on your own, and risk being ignored, or laughed at. It's always a gamble. Greta's gamble appears to have paid off. Here's hoping we can be all be as courageous, determined, and effective, as she is.