Agence France Presse: There could be a brief time this summer when there is no ice on the North Pole, a US scientist said Friday, blaming global warming that has melted the Arctic ice sheet over decades. “We could have no ice at the North Pole at the end of this summer,” Mark Serreze, a scientist with the National Snow and Ice Data Center in Boulder, Colorado, told AFP. “And the reason here is that the North Pole area right now is covered with very thin ice and this ice we call first …