I think that's a very limited view of the situation.
Whenever faced with a big new problem, there are two ways to get past that problem: either you backtrack, regress back to times when the problem didn't exist, or you move forward, and figure out ways to solve the problem without turning your back on progress.
This author effectively advocates turning our backs on progress, giving up the last few hundred years of development. He would have us go back to living in small self-sufficient communes, rather than focusing on growth and progress, to "save the planet". This suggestion is dangerously wrong. It is not "solving the problem", it is running away from it. The way through this problem is forwards, not backwards.
Ultimately, there is only one reason to "save the planet": so that we can enjoy it. There is no point in saving the planet if it means sacrificing ourselves along the way. AS the author rightly points out, killing ourselves to save the planet misses the point. Well, so does regressing back a few hundred years. We are who we are, we are a people/species who want to enjoy our lives, realise our potential, look to the future, move forwards, built greater, better, bigger things. That's basic human nature. The proposed solution goes against this basic human nature, and so it must ultimately fail (but it can probably cause endless misery before finally being thrown in the bin along with communism, theocracy, feodalism, and other Bad Ideas).
It is quite possible that fanatical ecologism will be the great blight of the 21st century, as fanatical nationalism was the great blight of the 20th.