Investors have a lot more to worry about these days than the collateral damage stemming from problems in Greece and China and a bumpy U.S. stock market. Ratings analysts indicate some new energy-related risks – most notably earthquakes near “fracking” sites and a plunge in the price of oil – have emerged as potentially significant challenges to investors in real estate and to mortgage lenders. Analysts at Standard & Poor’s said in a recent client note that earthquakes in proximity to fracking sites introduce a unique risk factor into the investment equation for those with a stake in real estate located in affected regions. “In particular, determining whether or not earthquake coverage is...