Another thing that I was thinking about: Why did Zod want to terraform Earth? It's not like Earth was inhabitable to Kryptonians, considering Kal El was living there his entire life, and in fact, altering Earth's gravity would depower all of the Kryptonians. You'd think he would be thriving in Earth's gravity, but apparently he wants that down home Krypton feel, even when the alternative grants him god-like power.