The European nations take climate change very seriously.

You should issue demerits for tree cutting or the destruction of humus.

The scarcest resource is not oil, metals, clean air, capital, labour, or technology. It is our willingness to listen to each other and learn from each other and to seek the truth rather than seek to be right

Models can easily become so complex that they are impenetrable, unexaminable, and virtually unalterable.

Mesarovic and Pestel are critical of the Forrester-Meadows world view, which is that of a homogeneous system with a fully predetermined evolution in time once the initial conditions are specified.

The world is a complex, interconnected, finite, ecological - social - psychological - economic system. We treat it as if it were not, as if it were divisible, separable, simple, and infinite. Our persistent, intractable global problems arise directly from this mismatch.

There are no separate systems. The world is a continuum. Where to draw a boundary around a system depends on the purpose of the discussion.