let s talk about this now with dan. he s a senior science editor at nationalgeographic.com. i want to start with this interview from geologist science guide from miami talking about what the rising ocean waters will do. by the midpart of the century, 2050, 2060, most of the barrier islands in the world are going to have to be evacuated. he s talking to our chad myers there, our meteorologist here at cnn. explain this timeline. why by midcentury? these are the low-lying places in the world where three feet of sea rise is, you know frk covering half the island. even a foot of sea level rise is a threat to these sort of low-lying places. that one you might see in locations like, you know, the keys, barrier islands, louisiana river delta, and so forth. even a foot of sea level rise where you only have seven feet of island, that s a lot. so this global warming will