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Chapter Two - Forests and the climate system

Published online by Cambridge University Press:  05 June 2014

By
John Grace
Edited by
David A. Coomes ,
David F. R. P. Burslem  and
William D. Simonson
John Grace
Affiliation:
University of Edinburgh School of GeoSciences
David A. Coomes
Affiliation:
University of Cambridge
David F. R. P. Burslem
Affiliation:
University of Aberdeen
William D. Simonson
Affiliation:
University of Cambridge
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Summary

Introduction

The planet was once much more forested. As human populations have grown, the forests have been cleared to make way for crops and livestock. This conversion from forest to agriculture started in Neolithic times (Brown 1997) but accelerated during the European colonisation of North America and other territories. Since the 1970s, it has continued apace in the tropics. The need to produce food is not the only cause of deforestation: humans have always used timber as fuel and as a raw material for construction. They will continue to do so, whilst new threats are likely to emerge: for example, in recent years tropical forests and woodlands have been cleared to make way for biofuel crops and plantations. These changes are causing widespread concern, as they may bring short-term benefits at the expense of the sustained provision of ecosystem goods and services (Foley et al. 2007).

Since 1990 the world’s forests have shrunk from 28.6% to 27.6% of the land surface, with substantial shrinkage in the tropics and slight expansion in the temperate regions (calculated from FAO 2011). Overall, we expect to see a continuation of this trend as human populations continue to expand and economic development proceeds.

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Chapter
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Forests and Global Change , pp. 21 - 46
Publisher: Cambridge University Press
Print publication year: 2014

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