A lack of parallax

[gfish]

In the SotU last night, Bush claimed the fight against terrorism was the defining struggle of the 21st century. Which, 7 years in, seems like a rather arrogant claim. What would someone from 1908 have said the defining struggle of the 20th century would be? That was 10 years before the Bolshevik revolution and 13 years before the word 'fascism' was even coined.

What do think the defining struggle of the 21st century will be? Personally, I'm hoping for giant robots vs. genetically engineered uber-kraken.