rainfall since the 1960s. hundreds of thousands of people have to leave their homes. and in south korea in august, the heaviest rain in 80 years hit areas around the capital, seoul, flooding the metro below ground and swamping the streets above. flood rescues in australia, as the ongoing global la nina weather pattern brings yet more extreme rain. sydney had its wettestjuly in over 160 years of records and there could be more to come, with a rare third la nina year now looking likely, and there could be further worrying signs for the future. scientists from the university of new south wales say atlantic ocean circulations, which in part take warmer waters from the tropics northwards, are showing signs of weakening, due to climate change. and this could mean more frequent la nina conditions and therefore flooding in eastern australia. what we see is that the heat is not transported any more i i from the tropics to the tropicsl