Because it is not something that happens in the timescales we would need or want it to happen.

Cold water subducts and travels away as it sink below the warmer water on the surface that then cools then subducts as well driving the system south at the north pole and north on the south pole. It is called the ocean conveyor belt and is driven by temp and salinity. It is what keeps the gulf streams moving and mixes the oceans. Warm water moves to the poles cold water moves to the tropics.

They are measuring year over year so summer is irrelevant to the study.

This is about antarctic ice which for the most part is not floating. And it being summer isn't relevant ice averages are measured and compared year over year.

It's a range and species have adapted to live in those ranges from desert to arctic. It is true that higher diversity is in temperate and tropical climates but that does not mean that rising temperatures in those zones will equate to even higher diversity or that increases in hot or colder climates will automatically equate to higher biodiversity. Most species have evolved to exist in the relatively narrow ranges to which they have adapted. Or have over millennia developed adaptations for ranges of temperatures like migration and hibernation. Changes in temperatures will affect these behaviors and affect diversity. We are already seeing this in marginal climates.

US defense budget is interesting. It is roughly 3.4% of GDP but also accounts for more than 10 percent of the federal budget and nearly half of the total discretionary spending. the GDP number is a bit deceptive.

Curious what you think it is now?

soft paywall

Phrasing!

Not if they want funding.