Preservation of natural habitat is very important.

Does the above sample mean natural habitat for animals, human beings, or all plants if it's a stand-alone statement? Thanks.
Not clear enough
Thanks, Marius.

It's not clear so it's open to different interpretations. Do you imply this?
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My thoughts are this: Humans no longer have a natural habitat. Therefore, natural habitat would be for animals and/or plants. Without more context, it's impossible to know whether you are talking about the endangered havest field mouse or the rare lady slipper.

In the European Union, a “natural habitat” is understood as a “ terrestrial or aquatic area distinguished by geographic, abiotic and biotic features, whether entirely natural or semi-natural”. This definition has been established by a Council Directive (92/43/EEC).
Part of my job has to do with management plans for the protection of "natural habitats of Community interest"... that’s why I can only think of the above (technical and specialised) definition.
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Tanit, you need to get together with Francesca! Although the habitats she is concerned with are aquatic.