A heat wave in Europe this week drove up temperatures to a record-breaking 115 degrees in France. In the American Midwest, scientists said climate change contributed to torrential downpours that flooded farms and killed livestock.In Delaware Bay, rising water temperatures are playing a role in a small but increasing number of cases of swimmers becoming infected with a flesh-eating disease called vibrio that normally only lives in tropical waters, according to a report in the Annals of Internal Medicine.