FILE - In this Thursday, Nov. 10, 2011 file photo, pedestrians use an elevated makeshift walkway to avoid the floodwaters in Bangkok, Thailand. The year 2011 brought a record heat wave

 

              FILE - In this Thursday, Nov. 10, 2011 file photo, pedestrians use an elevated makeshift walkway to avoid the floodwaters in Bangkok, Thailand. The year 2011 brought a record heat wave
FILE - In this Thursday, Nov. 10, 2011 file photo, pedestrians use an elevated makeshift walkway to avoid the floodwaters in Bangkok, Thailand. The year 2011 brought a record heat wave to Texas, massive floods in Bangkok and an unusually warm November in England. How much has global warming boosted the chances of events like that? Quite a lot in Texas and England, but apparently not at all in Bangkok, according to new analyses released Tuesday, July 10, 2012. It found no sign that climate change played a role in that event, noting that the amount of rainfall was not very unusual. The scale of the flooding was influenced more by factors like reservoir operation policies, researchers wrote. (AP Photo/Aaron Favila)