Shell Oil, frustrated last year by lawsuits filed by environmentalists and Alaskan natives, is eager to start exploiting its leases in the Beaufort Sea.

• 壳牌石油公司去年在由环境保护主义者和阿拉斯加本地人提起的诉讼中被击败，它渴望着开始利用其在波弗特海的租约。