Properly separated garden waste is compostable, regardless of the continent from which it comes. Narrow streets present collection challenges wherever they are. And high water tables make landfill siting more difficult, whether a country is highly industrialized or not. As repeatedly stressed above, there are also myriad differences from one place to another. The Sound Practices section does not ignore these differences, but tries to draw some general conclusions that may nevertheless have wide applicability.
Sound practices are an evolving thing.
The Source Book presents information and some conclusions about what is currently considered sound practice, but new technologies and policies could make some of these obsolete in the foreseeable future. Moreover, even at present there is not always agreement on what is sound.