Hundreds of people in kayaks and small boats have staged a protest in the north-western US port city of Seattle against oil drilling in the Arctic by the Shell energy giant. Paddle in Seattle was held by activists who said the firm's drilling would damage the environment. It comes after the first of Shell's two massive oil rigs arrived at the port. The firm wants to move them in the coming months to explore for oil off Alaska's northern coast. Earlier this week, Shell won conditional approval from the US Department of Interior for oil exploration in the Arctic. The...