[southerntofu]

> The effect of for example eucalyptus on the topsoil layer is as bad as full scale agricultural tilling.

This is true for any monoculture. We need to take into account how plants interact with their environment and fellow plants to preserve the humus (the topsoil layer whose microorganisms are essential to plant life). This is what permaculture is about.

There's not a single plant that we're going to find that we can grow everywhere and it's going to save the environment.