601 Looking for Rome; The End of Ice; Earth Day

Is it really too late? A mountain-climbing journalist explains why he says the accelerating effects of global warming have put the earth in hospice — and what it requires to turn it around. We'll also hear what the original Earth Day accomplished 50 years ago, and we'll take a closer look at Rome, where viewing more than 2,000 years of history can teach us a few things about our own civilization.

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