Associated Press: Few places in the U.S. are more vulnerable to rising sea levels than low-lying South Florida. It's a tourist and retirement mecca built on drained swampland. Other coastal states and the Obama administration are taking aggressive measures to battle the effects of global warming. But Florida's top Republican politicians are challenging the science and balking at government fixes. Among the state's chief skeptics are U.S. Sen. Marco Rubio and former Gov. Jeb Bush both possible presidential candidates...