The Expansion of English in China

Since WWII, and especially since the end of the Cold War, English has emerged as a new global lingua franca. Please watch “The Expansion of English in China” by the Open University and Dr. Daniel Dor – the study of human language.
The Expansion of English in China (1/4)119:10

Why has English emerged as the global language? What are some possible side effects of English’s rise in China? How does learning a new language affect a person’s identity?