HANOI, Oct 7 (AFP) - French President Jacques Chirac warned Thursday of a "catastrophe" for global diversity if the United States' cultural hegemony goes unchallenged. Speaking at a French cultural centre in Hanoi ahead of Friday's opening of a summit of European and Asian leaders, Chirac said France was right to stand up for cultural and linguistic diversity. The outspoken French president warned that the world's different cultures could be "choked" by US values. This, he said, would lead to a "general world sub-culture" based around the English language, which would be "a real ecological catastrophe". Citing Hollywood's stranglehold over...