Oil giant Shell has announced it is abandoning all but one of its federal offshore leases for drilling in Alaska’s remote Chukchi Sea. Last summer, the Obama administration approved Shell’s permit to drill in the remote Arctic waters, despite fierce opposition from environmental groups. Shell dropped its leases after its exploratory well in the Chukchi Sea showed only traces of oil and gas. On Tuesday, Greenpeace campaigner Vicky Wyatt called for further protection of the Arctic, saying: “President Obama must seize this opportunity and place the entire Arctic and U.S. outer continental shelf off limits to the fossil fuel industry for good.”