Alarmed at the sharply rising cost of hurricanes and other disasters, home insurers are pulling back from some U.S. coastal markets, warning of gathering financial storm clouds over how the United States pays for the damage of catastrophe. The development is yet another legacy of Hurricane Katrina, whose mounting toll of destruction along the Gulf Coast has crystallized a growing industry debate about the combined effect of climate trends and population growth in coastal areas. Some believe the two are creating a risk of losses so large that insurers could be pushed to the breaking point, leaving the government and taxpayers holding the tab for the next disaster. Since Aug. 29 — when the hurricane made landfall along the Gulf Coast — Allstate Corp., the industry’s second-largest company, has ceased writing homeowners policies in Louisiana, Florida and coastal parts of Texas and New York state. The firm has stopped underwriting earthquake coverage in California and elsewhere. Other firms have pulled back from the Gulf Coast to Cape Cod, notifying Florida of plans to cancel 500,000 policies. Meanwhile, homeowners are moving to state-backed insurer plans of last resort, which tend to be subsidized by taxpayers, and whose costs […]