Interesting point, that economic growth is a fiction - when the cost of growth is the deterioration of our own living environment, which is the true source of value. In fact, I'd posit that we do not even have the ability to produce "true value", we only know how to transform and consume it - perhaps in the same way that we're unable to "create energy" out of nothing. But then again.. Growth in general is all about consuming our surroundings, transforming the elements into new organizations, leaving waste behind.

Apparently, the main measure of economic growth is the gross domestic product - "the monetary value of all the finished goods and services produced", which is based on spending and consumption. Planetary entropy, as you say.

As someone else commented in this thread, what we need is a significant global shift in mentality and culture, our value systems and vision of what it means to be a grown-up civilization, not as an ever-hungry consumer, but an intelligent layer of nature.