A prominent environmental activist took the unusual road of not only blaming rising electricity costs squarely on renewable sources, but also for deriding the mainstream media for ignoring the connection. Michael Shellenberger, the president and founder of Environmental Progress, explained in a Forbes blog post Monday how the unreliability of renewable energy sources, such as wind and solar, is the main reason why electricity bills around the world have been getting higher. Despite renewable energy technology slowly becoming more affordable, Shellenberger notes, electricity costs are still rising because of the unpredictable nature of wind and solar. Both sources produce excess...