Personally I would move to Australia if it were not for the bugs and the snakes. They are everywhere, I know, but at lease here I can get away from them and we do not have poisonous snakes in the area. We do have cougars.
We have cougars too, my son is going out with one tonight. We do have 1 out of the top 10 most poisonous snakes in the world, sadly my area has the Eastern Brown, Number 2 or 3. But this little guy has no poison, nor any teeth, they are so cute, and I am not a snake fan.
I have believed firmly for decades that major corporations and financial institutions run governments--everywhere. And they will do whatever suits them if it's profitable. Anything that benefits humanity is secondary.
I don't think humanity is a non-consideration, I think we are viewed as consumers of the resources, i.e. water, food, etc..
As soon as they have their robots in place to do all of the manufacturing and labor and service jobs, they'll have little use for most of us.
Trying not to be incendiary as to avoid those arguments, but here's my thoughts. I think government is more than just getting in the way, they're encouraging the lack of cooperation you describe. Especially in modern times when this non-internationally cooperative isolationist "america first, nevermind the world" mentality and brexit are popular and supported. I don't remember the last time I had faith in a government, but at least before they were making a token effort of trying to work together with other countries to fight pollution, help developing nations and working towards new trade ideas. Now it's just a very vocal, very popular "me, me, me" attitude on the national level
"store solar power at night" That is the problem...there is no good way (efficent) of storing large amounts of electricty. You can convert it to potential energy by using the daylight electicity to pump water up hill, and then have it generate at night when it is realeased through generators, but that method is very ineffecient. "generate hydrogen from seawater" There is no easy/good way (electrolosis is expensive...uses a lot of energy) to generate hydrogen from water. You can do it, but it is costly...takes a lot of energy or in the case of Hydrogen Fuel Cells, the technology has not matured.
Storage is still the problem, hopefully with time the giant batteries will go down in price. Am looking at microgrids at the moment in my area, using the home batteries from individual houses along with a community sized battery. As electric cars increase there is the option of using the batteries in them to feed back into the grid up to a point, or at least into the home. The Nissan Leaf already does this and Tesla just told me to "Watch this space". In Oz some of our old coal generators are getting close to their expiry dates, I would like to see the money go into renewables not more coal stations. The saving makes batteries look less expensive. Still a long way to go I know.
I agree with the idea of international cooperation.