It is a dynamic planet, and change is what we can expect.
For instance how about a major drop off in population?
Preface:
chapt 26. From this moment, before 177 years, 3 months and 11 days have passed, by pestilence, long famine, wars and, most of all, by floods, the world will be so diminished, with so few remaining, that no one will be found willing to work the fields, which will remain wild for as long a period as they had been tilled.
1812 Napoleanic episodes
1912 + 2 = 1914 hitler stalin mao...
two hundred centennial and then...
2014 + 7 = 2021.
From 1960 - 42 = 1918
1960 + 42 or 40 (40 in desert or of age 20 plus the Ministry of Ezekiel of ~22) = 2000-2002 iraq...
2002 + 20 = ~2020-2022 the averages 2021.
490 = 500 - 10.
where 2000 = (500 x 4); - 4 (10)=1960