Wall Street Journal: Southeast Asia is scrambling to combat a deadly outbreak of dengue fever, the tropical illness transmitted by mosquitoes, which has hit parts of the region especially hard. Health experts suspect that an unusually early rainy season that brought mosquitoes out in April, months ahead of what is expected, contributed to the seriousness of the dengue challenge. Also, above-average temperatures that many experts blame on global warming encouraged early mosquito breeding. Meanwhile, dengue is thought...