"The volume of ice in the summer is only a quarter of what it was 30 years ago," says Peter Wadhams, professor of ocean physics at the University of Cambridge, Britain.
Porofesa wa fisikisi ya dilo tsa lewatle e bong Peter Wadhams wa University of Cambridge, kwa Boritane a re: "Selekanyo sa aese e e nnang gone selemo ke kwatara fela fa se bapisiwa le e e neng e le gone dingwaga di le 30 tse di fetileng."