It is illogical to speak of "terraforming the Earth." "Terraforming" means to change a planet's biosphere to match that of Earth. Selena should have used the term "kryptoforming."
Holding up the broken little device, Mon-El remarks "Unfortunately, the beacon did not survive the explosion." Yet this monumentally big explosion didn't even ruffle one immaculate hairstyle, and there's not as much as a speck of dust on any of those fancy clothes.