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how do we contend with this? how do we make sure we have public infrastructure that's ready for what's happening in the southwest? that's one. and then, two, also the impact of heat on food. we now know 500 million people across the world will be at risk of starvation because of heat-related issues. so this is not just heat exhaustion, the impact of heat on the body, it's also what happens to our food supply. >> so let me go back, if i can, jeff, because in the lead in i said that one expert called this a heat wave -- said there was a heat wave scenario that keeps climate scientists up at night. you were the person who said that. what that we haven't touched on right now, real world, keeps you up at night? >> well, i think just the understanding of what's causing these heat waves. i mean, you know, these heat waves are being caused by our continuing to burn fossil fuels, putting c02 into the atmosphere.