Julia Butterfly Hill 
Can you imagine caring so much about a single tree, that you’d spend two years of your life among its branches, your feet rarely touching the earth below? Julia Butterfly Hill did just that in 1998 and ’99 for the love of “Luna,” a 200-foot redwood tree that was in danger of being felled by loggers. She didn’t come down until an agreement was reached with the logging companies to give Luna a 600-foot buffer to protect her from destruction. Hill’s dedication brought nationwide attention to the problem of deforestation.