being treated. on wednesday mel vudev was visibly struggling. when the umpire asked if he can continue he said i m a fighter, i can finish the match but i could die. he added, i couldn t breathe properly. i think that was the most humid day we ve had so far. later that day spain s poola bedosa retired from her match with heatstroke. the tennis federation said matches will now begin later in the day due to these weather conditions. but he says that isn t enough. having olympic games in mids su midsummer in tokyo is not something you should do, and we should postpone it until october or november. reporter: but in the future it might not just be tokyo. according to a commentary published in the lancet by 2085 the number of large cities that