I have fairly high confidence that by 2100 we will have not only the technological capability to reduce the CO2 level in the atmosphere to anything we want, but we'll be able to geo-engineer most species populations and re-freeze the glaciers etc etc.
Not every problem faced by people in 1919 has been addressed by technology. Disease and old age still kill people. While it is true to say that many of the problems we face today will not be problems for people in 2100 we cannot know which problems will be fixed and which will be still intractable. Therefore, it is naive to assume that a solution for a specific problem will appear. Maybe it will but it is also possible that it won't.
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