Europe is unraveling and signs are mounting that the global recovery is in jeopardy. A Chinese purchasing managers’ index showed manufacturing grew less than estimated last month in that country, the weakest production growth since December. Manufacturing, the stalwart of the US recovery, grew at a slower pace in May in response to weakness in the global economy. A similar gauge of manufacturing in the 17-nation euro zone fell to a three-year low of 45.1 in May. And unemployment in the US unexpectedly increased providing further evidence that the labor-market recovery is stalling.