Apple’s second press blitz of the fall delivered details on a bunch of new devices. But the company also made some announcements on the environmental front that are generating buzz and raising questions, particularly regarding the recycled materials some of its 2018 product line will use. Specifically, Apple announced that the 2018 models of its MacBook Air and its back-from-the-dead Mac Mini are being built with a 100 percent recycled aluminum case, using a custom alloy that incorporates excess aluminum scavenged from the manufacturing process. Apple claims these changes, along with the incorporation of post-consumer recycled plastic into the Mac Mini, have reduced the two products’ overall carbon footprints by nearly 50 percent, and that the new MacBook Air is the “greenest Mac ever.” It’s the latest in Apple’s ongoing effort to fashion itself as a company environmentally-conscious consumers can feel good buying from. Last spring, Apple announced that all its data centers, stores, and offices are now powered by renewable energy, and it debuted a second-generation version of an iPhone recycling robot that will somehow factor into the company’s ambitious long-term goal, first a...