All this week, every nature shirt at Threadless is on sale for $12 in honor of the upcoming Earth Day. However, that’s not what’s really cool. What’s really cool is that for every order (no matter if it’s nature themed or not) they’re giving $1 to the Plant a Billion Trees cause (pretty self explanatory there). Get some cool shirts on the cheap, and plant some trees. That’s important, because trees are awesome. They give us oxygen, look pretty, and can be climbed–pretty cool.