The title is misleading, this isn't anything new. The credits system for developers requires them to acquire credits from somewhere else, and this typically isn't in the local area. Eg, a solar farm developer might have various solar farms across the country, some with more space kept natural and others that don't have the viability for it. The natural space in one area will offset the lack in another.
I'm not saying this is really the right way of doing it, nor am I arguing against maintaining natural spaces more locally, but the point is the article is making out that this is a new idea rather than an evolution of existing practices - practices that themselves are relatively new. Hell, any requirement to maintain natural spaces is better than it was 10-20 years ago. Things are moving in the right direction, even if they aren't yet where they should be.