In September 2014, all the cities of the world were invited to commit to a more sustainable and resilient future by joining the Global Covenant of Mayors for Climate & Energy. 9,000 cities across the globe have answered this invitation. Houston, Austin, Salt Lake City, Las Vegas (Nev.), Denver, and Tempe (Ariz.) have answered the invitation. Eagle Nest (population 290), and Santa Fe have answered the invitation. But Los Alamos has not.