Who needs it?
What is in it for me?
This is in fact the only thing you've ever posted. You now have 60K plus posts that only care about that question.
The answer is that no one is going to send you a check, so directly nothing. Indirectly, it helps our economy, provides jobs and reduces funding for bad governments that sit on most of the world's oil. If you still have a car, it drives down the price of gas.
I realize I lost you after "no one is going to send you a check" ...