My estimation as an intuitive is that if you live in most 3rd world countries this century your governments likely will either collapse or become so corrupt that you won't want to live there anymore. The only countries that have much hope likely are Liberal Democracies where people can adapt better to whatever changes occur fast enough to survive them.
I don't think "TOP Down" countries like Russia and China will fare very well and many people in "Top Down" countries likely will die or slowly die from various causes.
In some ways "Only the Strongest will survive in every country". And what this means is not only having a strong immune system but also those who have been fed well enough to survive, educated well enough to survive and who have a very strong will to live will actually survive this century at all.
PTSD will take out many many people from children to adults all over the world as storms and droughts and fires devastate more cities like Mexico Beach, Florida and Paradise, California and mudslides in Montecito, California last January 2018. So, it doesn't really matter whether a hurricane blows down your city or whether a flood takes out your city or whether you city burns down like in Paradise. It's all the same in the end because your home is gone, your friends are gone (either dead or moved away into a tent) and so the result is the same: Your home and home city are gone (possibly permanently).
So, survival will mean adapting to this ongoing new dynamic and accepting it as the natural order this century and finding ways to protect yourselves and your families whenever possible from the full brunt of mother natures fury during this multi-century climate change we are presently going through.
Will there even be people by 2100 left that aren't just basically robots with a human heart like General Grievous from a star wars movie? I'm not sure of the answer to this question at present.
But, what I do know is that the future is what we choose to make of it.
General Grievous is a fictional character and antagonist in the Star Wars franchise. He served as the Supreme Commander of the Confederacy of Independent ...
After the commando droids had taken control of the station, Grievous was contacted by their captainaboard his Munificent-class star frigate, who informed him ...