JLA #1

A group of aliens calling themselves the Hyperclan come to Earth professing to be galactic saviors. Having witnessed their home world suffer great ecological destruction, they seek to prevent the same thing from happening on other worlds. The general populace of Earth immediately ingratiate themselves to the Hyperclan, but members of the super-hero community have concerns over the team's seeming generosity. To demonstrate their pledge to heal the Earth, the Hyperclan use their powers to turn the barren Sahara Desert into a veritable Eden.