UNIDENTIFIED FEMALE: Is this legit? The U.S. has more tornadoes than any other country.

这样正常么?美国每年所遭遇的龙卷风比任何国家都要多。

Totally true. Tornadoes can form almost anywhere, but the U.S. gets most of any nation.

绝对正确，龙卷风几乎在哪都能形成，但是美国是形成最多的国家。

AZUZ: It`s not just tornadoes, the National Severe Storms Laboratory says thunderstorms in general are most common in America. And look at these stats from the National Weather Service: the U.S. gets about 100,000 thunderstorms a year, 10,000 are severe storms. We get floods, hurricanes making landfall. It`s part of the reason why some folks want to climate prove more parts of the U.S. That`s something that`s been tried by some cities around the world with both the wanted success and some unwanted side effects. It usually involves some major engineering work, and with that, comes major fees.

不光光是龙卷风，国家强劲风暴实验室指出，通常暴风雨在美国来说是非常普遍的自然现象，通过国家天气服务中心的雷达显示，美国一年大概可以形成100,000次雷雨天气，其中10,000次是强暴雨天气。洪水，飓风屡屡登陆美国国土。这也是人们为什么想要天气预报更加局部化的原因。在全世界的一些城市里曾经试运行过这样的天气预报，有的希望是成功的，有的不希望带来负面影响。这包括一些重要的工程量和主要资金。

CHAD MYERS, AMS METEOROLOGIST: You have to understand where we are in the world, how our weather is so different here in America. First of all, we have the Rocky Mountains to the west, we have a Gulf of Mexico, very warm water here. And the cold air that plunges to the east of the Rocky Mountains, and that`s where a tornado threat comes from: moisture here, dry air here, cold air here, and that is tornado alley. Something else we have, a very large Atlantic Ocean allowing those big storms, those hurricanes to come in at full throttle, full speed because the water is still very warm there. So where do we go from here? How do we get ready? I guess, how do we get climate ready? If it gets warmer and the water does go up, if the ice melts, and the water in the ocean gets another foot higher, how do we protect ourselves? Well, the first place that`s protected itself now, obviously, New Orleans. They built all of these barriers, did a very good job this year at protecting New Orleans.

你必须明白的是我们处于世界上的哪一地理位置，为什么我们美国的天气与其他国家大相径庭。首先第一点，落基山脉绵延在美国西海岸，同时位于墨西哥海湾沿岸，暖流经过。而寒流则被挡在了落基山脉的东面，这就是龙卷风形成的基地。水分，干燥的空气，寒冷的气流都聚集到此，这就是形成龙卷风的山谷。另外，浩瀚的大西洋也促使了这些暴风雨的形成。在最快的速度上形成了飓风是因为水流始终保持温暖的温度。那我们将要去哪呢?我们将做什么准备呢?我想，现在我们应该怎样预防气候变化吧?如果气温持续上升，水位也持续上涨，如果冰雪融化了，海洋里的水再涨出一英寸高，我们应该怎样保护我们自己呢?显然，我们现在要做的应该是保护这里，新奥尔良。他们建立的所有这些障碍，确实在这一年里发挥了保护新奥尔良的作用。

Now, those barriers did something else - they blocked the water from going into New Orleans, but they also really increased the amount of water that went into Plaquemines Parish. So you have to watch what you do, because you just can`t put a barrier around the entire world and hope that you stop all the water. I take you over her at Rotterdam, where they stop the water from coming down the river with these huge, just big gates right there. They will close, if there`s surge coming down from the North. And this is what will be. Right here. Those two gates right there will swing together and stop the water from coming in. Huge projects. I mean significantly big projects, when it comes to how much money this could possibly all cost.

现在，这些堡垒还发挥着其他的作用，阻止着洪水进入新奥尔良。但是，阻挡洪水进入的同时却也增加了普拉克明的存水量。所以你要看清楚你现在所做的这些，因为你不可能对全世界建起一个堡垒阻止洪水的流入。我带你去看看鹿特丹大坝，看他们是怎样让河水顺利通过的，就像是在那建了一个门。当巨浪从北部急流过来时大坝就关闭，这也是他的作用。这两个大门伫立在那里，共同阻挡着洪水的到来，给整个城市都起到了非常巨大的保护作用。我的意思是，当这一切都起到了应有的作用时，话费再多的资金也是有效的。

UNIDENTIFIED FEMALE: Is this legit? The U.S. has more tornadoes than any other country.

Totally true. Tornadoes can form almost anywhere, but the U.S. gets most of any nation.

AZUZ: It`s not just tornadoes, the National Severe Storms Laboratory says thunderstorms in general are most common in America. And look at these stats from the National Weather Service: the U.S. gets about 100,000 thunderstorms a year, 10,000 are severe storms. We get floods, hurricanes making landfall. It`s part of the reason why some folks want to climate prove more parts of the U.S. That`s something that`s been tried by some cities around the world with both the wanted success and some unwanted side effects. It usually involves some major engineering work, and with that, comes major fees.

CHAD MYERS, AMS METEOROLOGIST: You have to understand where we are in the world, how our weather is so different here in America. First of all, we have the Rocky Mountains to the west, we have a Gulf of Mexico, very warm water here. And the cold air that plunges to the east of the Rocky Mountains, and that`s where a tornado threat comes from: moisture here, dry air here, cold air here, and that is tornado alley. Something else we have, a very large Atlantic Ocean allowing those big storms, those hurricanes to come in at full throttle, full speed because the water is still very warm there. So where do we go from here? How do we get ready? I guess, how do we get climate ready? If it gets warmer and the water does go up, if the ice melts, and the water in the ocean gets another foot higher, how do we protect ourselves? Well, the first place that`s protected itself now, obviously, New Orleans. They built all of these barriers, did a very good job this year at protecting New Orleans.

Now, those barriers did something else - they blocked the water from going into New Orleans, but they also really increased the amount of water that went into Plaquemines Parish. So you have to watch what you do, because you just can`t put a barrier around the entire world and hope that you stop all the water. I take you over her at Rotterdam, where they stop the water from coming down the river with these huge, just big gates right there. They will close, if there`s surge coming down from the North. And this is what will be. Right here. Those two gates right there will swing together and stop the water from coming in. Huge projects. I mean significantly big projects, when it comes to how much money this could possibly all cost.