Ever feel that modernity has gotten so strange you must be living on another planet? In “The Twinning Project” (Clarion Books, $16.99), Robert Lipsyte of Shelter Island posits a second Earth created by alien scientists to study evolution. But humans, as humans will, have made a mess of things (our stock-in-trade: war, starvation, genocide, environmental degradation), and the project is being abandoned — no more Earths.