So, are you saying global warming is good or bad?
NASA has established that global warming is causing the northern oceans to support far greater populations of zooplankton life. These life forms the building blocks of life.
Some scientists are arguing there might be too much food, but I suspect they will find the same thing we find here with coyotes. When rabbit populations surge, it takes a while for the coyote populations to catch up, but they do catch up. Short term predictions that the rabbits are going to destroy our ecosystem are put to rest when two to three years later, the rabbit population has been put under control by the massive increase and more rapid maturity rates of coyotes.
Regarding the sea crabs. The serve an important ecological function. But nature hates a vacuum. Sticking with the coyote example, the elimination of wolves and "big" cats" caused a surge in the rabbit population, but coyotes filled the niche by expanding their population which had been controlled by the other predators. So, we don't see wolves, but we see plenty of animals.
So, if warmer water impacts the Alaskan sea crabs, most likely some other sea crab will move in fill its place especially given that crabs are "bottom eaters" and more fish life will produce more fish carcasses for crabs to dine on. But it takes time.
Acting like climate change is something new or something that can be avoided causes humans to behave in foolish ways as if we were above nature and not part of it.
Bottom line, as long as plants are thriving the world will adapt to climate change and animal populations including humans will migrate to those areas on the planet that afford the best environment for them.
Except in this instance, humans have the capacity if they choose to use it to accelerate these animal migration patterns and thereby take full advantage of the increased plant life.
Who knows the day may come when massive ships sweep the northern seas to gather up the excess algae to produce biodiesel. Some animals are more fragile than others do to their more specialized roles in an ecosystem. Dinosaurs had a great run, but eventually the ecosystem could not produce enough food to support them, and they gave way to smaller animals with the ability to produce their own "heat" or smaller reptiles that needed less food.
Humans are among the species that are perhaps the most adaptable as evidenced by the fact that we thrive from Alaska to the equator. There are humans that have physically adapted to living at high altitudes and others in cold climates and even other in hot climates.
Everything is going to be just fine. I miss not seeing dinosaurs, but I am kinda glad they are gone after watching the movie Jurassic Park.
Recenty, some scientists have adapted the belief and tried to convince others that somehow as humans we should "manage" the climate rather than adapt to it. I think that is a fool's errand. It won't work, we simply are not "God". We like all creatures have to adapt and focusing our resources on adapting makes more sense than fighting what we can't stop.
