Thousands of protected bald and golden eagles in America are expected to be killed by wind farms, after the companies were given a green light to operate high-speed turbines for up to 30 years.

Under the new rule by the Obama administration, wind companies and other power providers will not face a penalty if they kill or injure up to 4200 bald eagles, nearly four times the current limit. Deaths of the more rare golden eagles would be allowed without penalty so long as…