 Keeping us safe in this increasingly hot and dangerous world is one of the key concerns of Dr. Ari Bernstein. He's the director of the National Center for Environmental Health and the Agency for Toxic Substances and Disease Registry at the CDC. And he joins us now. Welcome back to Living on Earth, Dr. Bernstein. Great to be with you, Ainsley. Now, this recent heat wave has been affecting approximately 100 million people across 27 states. How would you link such an extreme event to climate change?