He is much more vigilant than I was at his age. He knows that some of humankind's uncontrolled behavior will destroy the environment. And he does his best to avoid making the same mistakes.
他比我當年是警覺多了，知道人類一些缺乏節制的行為是會殘害大自然的，也儘量避免犯同樣的錯誤。