Let's make this birthday one to remember.

51 years old (Born on February 18, 1974)

Happy birthday to the one and only Julia Butterfly Hill, whose adventurous spirit took her literally higher than most of us—way up into Luna's branches for over a year! Who else could turn tree-sitting from quirky hobby into environmental heroism?

From inspiring books like "The Legacy of Luna" to making bold statements about both ecology and taxes (two topics that typically send people climbing trees—but usually downwards), you've shown us we can indeed make a difference. Here's hoping your special day keeps you just as high-spirited but slightly closer to ground level. Keep soaring without splinters, Julia!