The reality is that most teens are well aware of whats going on around them, and pretty angry with the adults for the mess they are creating. Teens are generally intelligent people, they care deeply about their own future, and you will find that lots of them are working in many many ways to deal with the issues.
So why this negativity towards teenagers?
Divide and rule..
Here's one answer to that tactic .....
Do what you love, it's your gift to universe