Now the basic underlying point of green economics is that we face ecological constraints upon our actions.

FORBES: A Steady State Economy

Still, this emphasis on ecological constraints means that great emphasis is placed upon our limiting our abstraction of resources from nature.

FORBES: A Steady State Economy

"As resource constraints tighten globally, countries that depend heavily on ecological services from other nations may find that their resource supply becomes insecure and unreliable, and this has profound economic implications, " said Wackernagel.

UNESCO: OFFICE IN VENICE