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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.

With increased range, Audi R8 E-Tron revving up for production. Maybe

As Tesla Motors proved mightily in 2013, an expensive EV with a long range can sell quite nicely, thank you very much. Perhaps Audi was taking notes, since its all-electric R8 E-Tron's on-again/off-again odyssey appears to be on again, according to UK's Autocar, citing Audi's Urlich Hackenburg. The model is near the approval stage for production, and the key to the green-light is the fact that its single-charge range has been almost doubled to 250 miles. The R8 E-Tron gained kudos in these parts last June by turning in a rather brisk 8:09 time around Germany's Nurburgring track, a record for a production electric vehicle (check out the really quiet video here). Still, plans for the 376-horsepower model, which has two electric motors and was first shown off at the Frankfurt Auto Show in 2009, had been put on the proverbial blocks largely because of a relatively short single-charge range of about 150 miles. Then word came out last spring that Audi would produce maybe 10 units before reports from Australia's Drive late last year indicated that plans for potentially broader production were being resuscitated.

MT's Jessi Lang recounts her harrowing Autobahn R8 crash

Automotive enthusiasts know the name, face, voice and stories of Jessi Lang well. And if they don't, they should. The longtime Motor Trend video presenter and host of The J-Turn is a regular fixture on the automotive scene, and one of our favorite to watch. But a year ago, Jessi vanished from the scene. And we're sad to say she hasn't been kicking back enjoying umbrella drinks on the beach all this while. A year ago Lang went on a pilgrimage to Germany, driving a Porsche 911 GT3 on the Nurburgring and an Audi R8 modified by Abt on the Autobahn when the unthinkable happened. A car swerved out of its lane and into Jessi's path. A catastrophic collision ensued, and Lang was seriously injured. Jessi's been recovering from the multiple fractures and life-threatening lacerations ever since, and in her first appearance back on the net, has returned to tell her harrowing but courageous story. We wish her all the best on her long road to recovery, hope to see her back to her old self again soon, and invite you to watch the heart-rending story here.