Are there still rooms left for us?

This year the planet Earth reaches its landmark human population, 7 billion! And projected to be 8 billon in year 2030 and 9 billion in year 2050. Homo sapiens perhaps consist of the largest mammal population in the earth. The topic was highlighted by the January 2011 issue of National Geographic, which showed a tremendous acceleration of human population growth in the past millenium of the 20th century. The number of mega cities with population exceeding one million has increased from a mere 3 in 1800 (Beijing had 1.3 million then together with Tokyo and London) to a staggering 442 in year 2010 with Asia having most crowded cities. Population growth was in no doubt one of the central focuses of the media this year. Many media sources discussed the consequence and solutions to accomodate increasing number of humans. Building vertical cities become a future trend given that it’s after all a reality.

(Figure adopted from prb.org)

With the advent of industrialization and advance of medicine, human life style morphed from nomadic and periodic migration to modern city dwelling. The former life style was at the mercy of mother nature and gradually phases out in most human society. The latter provides a long-term residence but in the meantime features more frequent and more damaging pattern of short-term human travelling for business and pleasure as well as trading transportations in air, land and ocean.

Aggravating the situation, consumption culture imposes much more stress on the environment. Mass consumption as a vehicle drives the global economy, labor market and international trading, and large-scale consumption is also a determinant for policy making, a pressure for foreign relations and a motivation for scientific and engineering research.

How much pressure the Earth can uptake for our consumption desires? Is there a tipping point that leads to a catastrophe?

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