Children ask me why the water quality of Qiandao Lake in Canada is much better than that of Qiandao Lake in Chun 'an County. How to explain it clearly?

If we want to educate children to be patriotic, it makes sense to say that North America is not easy to be polluted because of its small population, high level of economic development and relatively developed management and control.

If you are disappointed in China, and the goal is to train children to emigrate, say that China is too backward, and the party's decision-making mistakes lead to pollution first and then governance, so you should study hard to go abroad and enjoy a high-quality life.