The A4 Avant g-tron is the latest in Audi's family of natural gas hybrid cars. The vehicle primarily runs on natural gas but can switch over to gasoline.
Germany's environment ministry wants to halve CO2 emissions levels for new vehicles by 2030 - more than the EU's goal. The auto sector is already alarmed by a new EU exhaust test due in September.
French train maker Alstom has rolled out the world's first hydrogen-powered train on a regular route in Germany, in a push to challenge the reign of polluting diesel trains with costlier but more eco-friendly technology.
While diesel cars increasingly look to be on the way out, another big polluter is often ignored: shipping. Will electric vessels, including the first e-barges, help the industry clean up its act?
French car maker PSA is reportedly seeking a refund from General Motors (GM) after discovering it was allegedly misled about Opel's emissions challenges prior to the acquisition of the German car maker.
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