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Will Steffen

The trajectory of the Anthropocene: The Great Acceleration

The Great Acceleration marks the phenomenal growth of the global socio-economic system, the human part of the Earth System. It is difficult to overestimate the scale and speed of change. In little over two generations –or a single lifetime –humanity (or until very recently a small fraction of it) has become a planetary-scale geological force.

Planetary Boundaries: A fourth danger line crossed

The Planetary Boundaries framework was first introduced in 2009, when a group of 28 internationally renowned scientists identified and quantified the first set of nine planetary boundaries within which humanity can continue to develop and thrive for generations to come. A Jan 2015 update by the researchers say a fourth of these boundaries – forests – have