There seems to be a growing proportion of people out there who support environmental causes and aren’t shy about getting naked in public to show their support for them:
Of course, even if you are a little shy, it’s a whole lot easier to strip off in front of lots of other people if everyone else is going to be naked too. For some people, it’s an important enough cause to be worth overcoming their shyness or embarrassment to make a statement. For others, they love to be naked in public, rarely get the chance and this is a great opportunity for them. Others love to see lots of people naked up close and are confident enough to get naked to achieve that.
Human psychology is a complex thing and people fall into all sorts of categories. The fact remains, if you want to a “justified” excuse to get naked with lots of other people in a place nudity usually would not be accepted, events such as Tiger Streak, Bear All for Polar Bears and World Naked Bike Ride are becoming more widespread and popular.