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Recharge Wrap-up: Ferrock a carbon-negative cement substitute, Audi makes e-diesel

A cement alternative uses recycled materials and traps CO2 rather than producing it. Invented by David Stone at the University of Arizona, Ferrock uses recycled steel dust and glass to produce a substance stronger than conventional concrete. Cement has a high carbon footprint from the high heat needed to process the limestone. Ferrock needs no such heat, and it actually uses CO2 to harden, making it, as Stone calls it, a carbon-negative material. Learn more in the video above, see the transcript at PBS NewsHour and read more at Green Car Reports. Teslarati offers a detailed rundown of Tesla's new Valet Mode feature for the Model S. Part of the Firmware 6.2 update, Valet Mode allows the owner to disable certain performance features and block personal information when letting someone else drive the car. It limits the car's to speed to 70 miles per hour, and caps output at 80 kW. It can also disable mobile app access, Homelink, Bluetooth and wifi and the "Places" function, which stores addresses for you. The folks at Teslarati did find some shortcomings in the new feature, though. Read more at Teslarati. Audi has produced its first batch of e-diesel made from water and CO2. The fuel is made by reacting hydrogen from the water with CO2 to make long-chain hydrocarbon compounds called "blue crude." That can then be refined similarly to crude oil to make e-diesel, which is a fuel free from sulfur and aromatic hydrocarbons. That e-diesel can be used on its own, or mixed with fossil fuel diesel to power a vehicle. "In developing Audi e-diesel we are promoting another fuel based on CO2 that will allow long-distance mobility with virtually no impact on the climate," says Audi Head of Sustainable Product Development Reiner Mangold. Read more in the press release below. Fuel of the future: Research facility in Dresden produces first batch of Audi e-diesel - The verdict: Pilot plant produces high-quality diesel fuel - No need for mineral oil: e-diesel made from water, CO2 and green power - Minister Wanka: "Synthetic diesel using CO2 is a huge success" Audi has taken another big step in the development of new, CO2 neutral fuels: A pilot plant in Dresden has started production of the synthetic fuel Audi e diesel. After a commissioning phase of just four months, the research facility in Dresden started producing its first batches of high-quality diesel fuel a few days ago. To demonstrate its suitability for everyday use, Federal Minister of Education and Research Prof.

Weekly Recap: 2016 CTS-V gives Cadillac new momentum for the new year

It's been a rough year for Cadillac. The historic luxury carmaker been in the news for all of the wrong reasons: Declining sales, ditching its advertising agency and the relocation of its headquarters from Detroit to New York. But in late December, Cadillac reminded everyone what it does best: Build some of the rawest and most compelling luxury sedans in the world, as evidenced by the 2016 CTS-V. This monster churns out 640 horsepower from a supercharged 6.2-liter V8. Sound familiar? That's the Corvette Z06 engine, and it makes this CTS the most powerful production Cadillac ever. It also puts the sporting divisions of the Germans on notice. The new CTS-V easily overpowers the Mercedes-Benz E63 AMG S 4Matic and its 5.5-liter biturbo V8 rated at 577 hp, and the BMW M5 (with the competition pack) and its 4.4-liter twin-turbo V8 that pushes out 575 hp. The rear-wheel drive Cadillac can sprint to 60 miles per hour in 3.7 seconds, which is close to the 3.5-second time turned in by the 4Matic-driven E63 S, and a bit quicker than the 4.1 seconds posted by the M5. With Magnetic Ride Control, General Motors' stout eight-speed automatic transmission (also used in the Corvette), Brembo brakes and a carbon-fiber option package that pretty much builds your car out of carbon fiber – it's clear this Cadillac means business. Truth be told, we expected this CTS-V to deliver. It's been a serious sports sedan for a decade, and the recent generation and its 556-hp arrogance have been particularly memorable. But notice what we're doing here? We're talking about product. Not who makes Cadillac's ads, or if the brand's headquarters has a mailing address in NYC. Like the 2016 ATS-V that's due in the spring, the debut of the 2016 CTS-V (on sale in late summer) is a shot in the arm for Cadillac, and its arrival comes during time of transition. The brand is trying to reinvent itself as a modern luxury maker. It wants new customers, a different image and obviously more sales. Those things are going to take time, but with a 640-hp sledgehammer of a sports sedan on tap for next year, Cadillac can still maintain some of its swagger through all of the change. Other News And Views 1984 Audi Sport Quattro heads for the auction block If you're into '80s rally cars, you're really a car person. But if you're into that stuff – and we are – this 1984 Audi Sport Quattro is sure to get your blood flowing.

Next-gen Audi RS4 coming, might make it to America

Let us be frank: The second-generation Audi RS4 was one of the best, most exciting cars of the past decade. A four-door sedan with a 4.2-liter V8, all-wheel drive, and a six-speed manual transmission? What wasn't to like? While you can still get a taste of the B7 RS4's character with the current RS5, it isn't quite the same. That's why we're giddy about a new report from Car and Driver, which claims that not only is a new RS4 on the way, but that it could, maybe, possibly return to the United States. As previously reported, the fourth-generation RS4 will go back to a twin-turbocharged V6, after two generations of unassisted V8s under the hood. As per RS4 tradition, it will also be limited to a five-door Avant body style, because "that is what people expect from the RS4," Quattro GmbH boss Heinz Hollerweger told Car and Driver. An RS5 Sportback could also be in the offing, which might remain more true to the character of the first US-market RS4. The US question, though, remains an iffy one, largely because of the Avant shape. Audi has reduced the number of wagons it's offered in the US over the years, dropping the A4 and A6 Avant, although the former is sort of still offered in the form of the Allroad. But that position might be enough to keep the next-gen RS4 off our shores, although as the Quattro boss told CD the US market is changing and "there is more demand there [for wagons], so maybe that will change." Well, Herr Hollerweger, we're here to tell you that America loves wagons, and that you should put the next-gen RS4 on sale over here post haste. Danke.