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Keep dry feet in the hinterlands. in one hundred years so how much sense do we need to cope with sea level rise one scenario the ministry has to consider involves giving up low lying coastal areas altogether should it become too hot to defend them we don't want to think about that but maybe that's what will be the case someday yes to counter the erosion of its coastline the netherlands is trying a dual strategy building up defenses against the forces of wind waves and currents and harnessing those same forces to protect the coast a sand engine project is a pioneering effort to meet the challen...

>> let me tell you, long beach you are approaching your low tide time, as well. any time of receding you do see from the water is being exacerbated from being at low tide. back on the pictures of hawaii, you have been talking a lot and very well about the wave all of those waves, any wave you see at the beach enjoying your day, those are wind waves. those are stirred up by the wind. that is just running across the surface of ocean and that friction is causing those waves to happen. that is what you see every day. these tsunami wave, these are not the same as all. the water gets displaced at th...

Indonesia from several years back where the water literally just completely comes ashore and causes major damage. the fact that we're not seeing that right now, what does that tell us? >> a couple things. those will be the images that we'll all think of when we hear tsunami. but what you're seeing right here, those are wind waves. every wave you see when you go hang out at the beach it's from a wind wave. that's wind moves across the water, it's a friction. it forces the waves up and that's what we see every day on the beach. a tsunami wave is a very different thing. it is caused by the bottom...

Attention to getting a kit together for next time. >> of course, it's a beautiful island, beautiful place to live, but you definitely have to be prepared for this time of thing. thank you, david. we wish you the best. stay safe. >> thanks. >> those surfers we've been watching may not realize this, but there is still the danger of tsunamis. exactly how do these underwater rumbles send massive waves racing across the ocean? when we say racing, we mean racing. 500 miles per hour across the pacific. anatomy of a tsunami for us, rick, out of this -- how does this work? >> couple of things. typical ...

Enormous numbers of fish and their worth is steadily increasing in contrast to oil which we should leave where it is. the great torrent of sludge here behind me is the roar of money that may fill our state coffers one day. that. rosen says instead of dreaming of mines or offshore oil wells greenland should take advantage of the resources that are already available in such abundance. the powerful forces of wind waves and currents transport mud and sand from the land into the sea. people who live on the coast the familiar with those natural forces and they know they have to stabilize their shows...