The remaining solution is therefore to break up the ice, which is of course the method that has long been employed, but which increasingly comes under discussion with the opening up of Siberia, Alaska and Greenland.
Isisombululo esishiyekileyo kukwaphula umkhenkce obuyindlela eyayisetyenziswa kudala kodwa ngokukhula kusaxoxwa ngayo ukuba ivulwe, eSibheniya, eAlaska nase Greenland.