If China environment is so terrible?

Lunched with my colleagues, i still cannot understand that why they want to get rid of China so imminently, i had a very happy childhood at my hometown and I loved the small town, regd Shanghai, I lived here for six years, studied, loved and working for better living, I had a unexplainable feeling about this city, so friendly and so strange ,speak of migration to another country, i feel it's not my destination and I do not want to bet it for anything, maybe due to my dual-personality, just like my life, determined by my hesitation and substantial, but i enjoyed my unexpected life.