According to reports that have been circulating for years, Bangkok, which was built on swampland, is 0.5–2 meters above sea level, and is sinking at a rate of 2–3 centimeters each year . It's predicted that a large part of the city will be underwater by 2030, 2050, or the conservative estimate of 2100.
Pretty soon they'll have to start constructing more elevated roadways - with escalators feeding down to the rooftops of the buildings. Either that, or relocate the capitol city elsewhere.
Personally I think they should just convert Bangkok back into the floating bordello it once was, and relocate the government to a remote military installation in the mountains somewhere, where all the Generals belong anyway.