Climate Central: The share of total global electricity production generated by renewable energy is climbing, mainly because solar photovoltaic systems are becoming less expensive, according to a report released Monday by the United Nations Environment Programme and Bloomberg New Energy Finance. Wind, solar and other renewables, excluding hydropower, were 8.5 percent of total global electric power generation last year, up from 7.8 percent in 2012, the report says. That comes just after Bloomberg and Pew Charitable...