President Joe Biden’s Executive Order No. 14008 of January 2021 called for the Administration to conserve at least 30% of the nation’s lands and waters by 2030. To accomplish this ambitious “30 by 30” effort, the Order directed federal agencies to work with tribal governments, among others, to propose lands and waters as qualifying for conservation. This Comment examines "areas of critical environmental concern" and their potential role in the 30 by 30 program, particularly their potential to enlist tribal governments in helping to manage lands of tribal cultural significance.