This stream of meltwater on the聽Rh么ne glacier in Switzerland has been dyed pink by a team of researchers and students from the Swiss Federal Institute of Technology in Zurich. The idea is聽to create a visual aid that helps them better monitor the water鈥檚 rate of flow. This glacier has lost around 60 per cent of its volume since 1850 and, like most such alpine features, is threatened by聽rising temperatures.