Wall Street Journal: Add mudslides to the mix of global-warming worries. With California’s fire season in full swing, residents in charred areas such as the one around this bucolic resort face the prospect of catastrophic slides on newly denuded hills when winter rains return. A Los Angeles County crew cleans up after a mudslide earlier this year. Mudslides often follow big fires as part of a natural process that has gone on for millennia in the West. But forestry experts are increasingly …