Let's say that a group of people know with 100% certainty that the global society will collapse due to a climate-change-induced catastrophe by the year 2050. What actions can they take in order to fare the best in terms of survival and quality of life once that happens?
They don't know anything else about how exactly the collapse will take place or on what kind of timeline. They are only equipped with the scientific and political knowledge of the present day.
Some key questions I am asking myself here:
What places are more likely to be able to yield crops should climate change drastically?
For example, I imagine Europe wouldn't be the best place. In the short run the increase in temperature might make farming easier at higher latitudes. However, should the atmospheric and oceanic currents change significantly, resulting in diverting the Gulf Stream from Europe -> it will essentially become a tundra.
Which places are least likely to be negatively affected by the social unrest related to food shortages?
This probably has the most to do with population numbers. For example, I imagine, once there is not enough food to go around US will not be a fun place to live, especially due to widespread gun use etc.
What about the mass migration and inevitable wars?
Some places will be affected sooner than others and we can probably expect people migrating from where there is no food/water to where there is some. This can't end well. People seem to have trouble in accommodating a 4.6 refugee Syrians globally right now. Let's see what would happen once 2.5 billion people have to relocate.
I'm assuming action would need to be planned and taken way before the troubles really do kick in because after they do, relocating and establishing a living space might be prohibitively difficult.
Also, the group of people doesn't have clearly defined numbers (i.e. can grow and shrink) but we start essentially with a core of say 15 people. The numbers can change depending on how convincing that core group can be / how good at attracting other members. The core group also doesn't have massive resources at their disposal, lets say \$20,000 in savings each and jobs stable enough to allow them a freedom to take out a collective mortgage on whatever they decide to build (say up to \$400,000 per person).