In the age of limits, we are hitting up against the capacity of the planet to provide for us – yet we are reacting with blank denial. This story is unfolding, in one form or another, in the rainforests, the air, and in the planet's climate itself.
The is the core problem. See Jared Diamond's book Collapse for much more on this. The world is not cornucopian - we can reach absolute limits and we are almost there.