The Center for Biological Diversity (CBD) has filed a formal notice of its intent to sue Secretary of the Interior Ken Salazar for not evaluating the environmental impact that could result from an oil spill off Alaska’s northern coast. In late 2009, Secretary Salazar approved Shell’s plan to drill in the Beaufort and Chukchi seas. The CBD argues that the Endangered Species Act requires Secretary Salazar to re-evaluate the validity of Shell’s drilling permits. According to the CBD, the Deepwater Horizon spill incident calls into question Secretary Salazar’s conclusion that there is little risk of a large spill off Alaska’s icy waters.