text:  On the TED Radio Hour, over the last few years, former White House chef Sam Kass has been hosting meals that he calls last suppers. On the menu, ingredients that are at risk because of climate change. I hope it's not that people feel guilty or depressed. My hope is that we understand what to take is really like fully our way of life. The future of food. That's next time on the TED Radio Hour from NPR. Beginning Saturday afternoon at three.