 Second, another persistent line of criticism might be labeled the “subsystem” worry. It’s consistent with the Past Hypothesis, after all, that none of the subsystems on Earth ever display thermodynamically asymmetric behavior. How exactly does the global entropy increase of the universe imply local entropy increase among the subsystems (which, after all, is what causes us to posit the Second Law in the first place)? See Winsberg 2004 for this objection and Callender 2011a, Frisch 2010, and North 2011 for discussion.