ABU DHABI, United Arab Emirates (AP) — Ahead of his final race in Formula One, Sebastian Vettel lined up for the national anthem wearing a T-shirt with a picture of Earth, a nod to his environmental activism. Then eight jets flew overhead trailing colorful smoke. It was a moment that highlighted the delicate balance the four-time F1 champion treads as a lifelong auto racing fan increasingly uneasy at the toll his passion takes on the planet. “It’s a huge privilege being in the position that we are in and with that comes some responsibility. So I hope to pass on a little bit to the other drivers to carry on…