Air's electro-pop generally lives up to the group's name. But their fifth LP sounds a bit, well, polluted. "The world is on the brink … of extinction," intones a fried robot voice on the opener, "Do the Joy," while vintage synths ride a gnarly stoner-rock bass line. Actually, the new dirt and gravitas are refreshing, as is the groove weight of guest drummer Joey Waronker. "Eat My Beat"...