Not all marine life, just the big stuff. We just added a ton of sugar, fat and protein to the ocean, so I think we’re going to see an explosion of microbial life.
Now, with milk being opaque, I think we are going to kill most of the phytoplankton and replace it with bacteria that produce CO2 as a byproduct of their metabolism, so I do think we’re going to drastically change the Earth’s atmosphere and more or less run out of oxygen eventually, so we are definitely all dead. It’s just a question of how long it takes.
Frankly, if the goal of the administrations was to be helpful to Russia’s offensive, then halting shipments while muddying the waters with inconsistent messaging would be an excellent way to accomplish that.
Stop the shipments, but lie about it and say that you will ship more in the future. Then just never actually do that. This keeps them hoping for shipments that will never actually arrive.
edit: Another possibility here is that the Def Sec Hegseth does not want to help Ukraine, but Trump himself does not actually care one way or another, and thus could be convinced to overrule his Def Sec.
Tough to say.