If you read the 23 chapters of "The Alien War" you see how the Space Marauder tribes have been Hired by the Galactic Government to help at least some humans to survive Global Climate changes now

 If you are going to read the 23 chapters so far of "The Alien War" you might not want to read this because there will be many spoilers here if you want to read the whole thing.

So, the following is a small synopsis of what happens in "The Alien War"

Basically, the Alien War is about the Galactic Time Guard trying to find a way to not have humans go extinct sometime during the next 300 years here on earth. (in other words all humans gone).

So, "The Alien War" is a fake War put on primarily by the Galactic Government to make sure the major powers like the U.S. and the EU and Russia and China and Japan and other nations survive.

by 2100 AD it is expected that the world population of human beings will be 1/8 of what it is now caused primarily by Global Climate change which causes mass starvation this century and possibly after this century too.

However, it is generally agreed by all true scientists that the most Amount of people that can survive (for thousands of years on earth is around 1 billion people (if they are all living on the surface of earth).

However, it is also true that if all cities and structures are torn down on the surface and you use all the tillable land for growing food this might rise to 14 billion people that the planet could sustain too if everyone lived underground mostly.

Living underground ends the need for such power sources because underground temperatures stay more even so only Light and the circulation of fresh air becomes important then for human survival.

The point here is that Global Warming and Global Climate changes will extinct all humans if humans don't learn to survive Global Climate changes.

However, it is also true that AI could solve this problem if the right question was asked of the right AI designed specifically for this purpose. However, listening to the solution of the AI would not be followed by really greedy people who don't care if their children or grandchildren survive this century anyway.

In other words many financial sacrifices are necessary for any humans at all to even survive this century. If you go to the ocean in California right now and watch the shorelines eaten away every day this last week at high tide you can begin to see what I'm talking about as southern California homes on the coast first have their windows looking out to sea broken and next their homes destroyed by huge waves and high tides. 

NOTE: This might be interesting for you. If you want to know how many people (theoretically now) will still be alive in your country just divide your nations population by 1/8 to see what it would be.

At least theoretically that's how many people will still be alive of all ages in your present country you live in here on earth.

So, the biggest thing people will likely be dealing with the rest of this century and centuries to come will be the Grief of Loss of So many people 7 billion people (of the total number now) will be gone of the total in 2100 AD (theoretically for now).