I will worry greatly after about 200,000,000 years from now. Until then I will drive, BBQ and burn wood.
We would have 300,000,000 years before we had to start worrying if it were not for the insane ideas of the ecologists.
What about that 2 mile diameter nickle-iron astroid coming out from behind the Sun and due to hit in a few weeks time? Better hurry the BBQ along but no worries about burning wood or gas as it will all burn up after the impact ...