It boils down to humanity having polluted the oceans for centuries, and to prove his point, Orm showed Arthur some holograms of the various ways have tainted Earth’s waters.
We have Patrick Wilson’s Orm, a.k.a.
Included among the footage is an oil platform on fire, which looks quite similar to the one that Clark Kent rescued all those workers from early into Man of Steel, as you can watch below.
Ocean Master, to thank for this supposed tie-in, as during the first half of Aquaman, after Arthur Curry is captured by Atlantean forces after meeting with Mera and Vulko, Orm explained to his chained half-brother why he wants to attack the surface world.