Beautiful explanation of what The Happening is all about
The trees, the toxins, the nuclear plants, the winds...none of that were meant to be taken literally. They were just symbols, Night Shyamalan's movie is all about us, how we sometimes struggle to cope with our life and how we can survive if we show faith. Read more of this blog to make sense of what The Happening is. Since now I've a clear explanation, I feel this movie is indeed one of his best works -
http://www.denofgeek.com/movies/26050/looking-back-at-m-night-shyamalans-the-happening