AAP: A robot that mimics the porpoising movements of a dolphin and is guided by GPS could play a key role in further determining the extent of climate change. The $200,000 remote-controlled ocean glider was launched off the Tasman Peninsula in February to monitor the East Australian Current and has since been retrieved after a 1500-kilometre voyage around and under the Tasman Sea. A second glider is set to be deployed from Portland, Victoria, next week to collect data on the Leeuwin …