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Extend unemployment benefits or something in the senate having to do with a fund for coalminers who are owed payments. republicans proposed to use this to repeal the medical device tax. >> the big thing here, dehaven't raised he gas tax. that strikes me -- their their arguments against the gas tax and who gets hit bay gas tax, but that's the problem. given that we haven't raised the gas tax in 20 years, that means it's fallen by 39% in real terms and cars have gotten more fuel efficient. so the gas tax is like a user feel. you pay for the road. >> because you're driving on the road. so gas tax...

Levels have gone down about 40% since 2005. >> nitrogen deox side is a smog that comes from vehicles and cole burning power plants. it forms the ozone. >> why is the air getting better even though the number of cars on the roads have increased? >> the cars are becoming more fuel efficient. >> and the power plant now scrub most of the emotions out before they can get to our lungs. in 2012 about 3.7 million people from around the world died from effects of outside air pollution. the people whose smog has hit the hardest on the ones who can feel the improvement in the air. >> people who has asthm...

Fuel efficient, and cheaper than their full-sized peers. >> they're really a lot of fun. on the inside you feel like you're in a full suv. >> reporter: while the compact suvs may look entirely new to americans, they're already all the rage overseas in china and india. globally smaller suvs account for about 2.7 million in annual sales. more than 1 million in asia. 1 million in europe. and just 250,000 in the u.s. analysts say it's now those foreign markets which are also growing much faster than ours that are driving the future of cars. and then, of course, there are the flashy cars that, no m...

Shifts. 24 hours a day, churning out some of the most high-tech, fuel-efficient, high performance cars in the world. that's a story of american ingenuity, american grit. everybody has a right to be proud of it. today, we are taking the next step. heavy duty trucks account for just 4% of all the vehicles on the highway. i know when you're driving sometimes, it feels like it is more. but there are only 4% of all the vehicles. they are responsible for about 20% of carbon pollution in the tran transportation sector. trucks like these are responsible for about 20% of our on-road fuel consumption. b...

Navy ba serks just outside the city. here's what went on. >> we do testing and modelling, and then it turns into a fleet. >> he is talking about the naval service warfare center outside washington. a remarkable installation where scientists design, build and test ship prototypes. how important is this facility in designing the navy of the 21st century? >> you don't want to just go out and build a new ship. you want to be able to develop it in a smart way. you reduce the risk, reduce the cost by using models. >> it starts on computer. they test the shape of the hull, materials to be used. how t...