Richard A. Betts of the Hadley Centre has written a summary article in Nature Geosciences with respect to the article
Vivek K. Arora1 and Alvaro Montenegro, 2011: Small temperature benefits provided by realistic afforestation efforts. Nature Geoscience. Volume:4, Pages:514–518 Year published:(2011)DOI:doi:10.1038/ngeo1182 Received17 January 2011Accepted13 May 2011 Published online19 June 2011
Richard’s article is
Betts, Richard A., 2011: Afforestation cools more or less. Nature Geoscience Volume:4,Pages:504–505Year published:(2011)DOI:doi:10.1038/ngeo1223 Published online29 July 2011
with the headline
‘Forests affect climate not only by taking up carbon, but also by absorbing solar radiation and enhancing evaporation. In the tropics, the climate benefit of afforestation may be nearly double that expected from carbon budgets alone.”
Excerpts from the paper read
“For policy purposes, the climatic value of forests is measured solely in terms of carbon uptake and storage. But conversion of croplands to forests also affects climate through the modification of land surface properties, such as reflectivity and evaporation”.
“The use of the carbon metric — which does not reflect the true impact of afforestation, reforestation and deforestation — may therefore significantly undervalue tropical forests as a cooling influence on climate. The assessment of different mitigation measures needs to go beyond comparisons of radiative forcing.”
“….climate change is not just about carbon……. as human transformation of the land surface becomes increasingly central to climate policy, it is ever more important to consider non-carbon effects on climate.”
This article provides additional documentation of our finding in
Pielke Sr., R., K. Beven, G. Brasseur, J. Calvert, M. Chahine, R. Dickerson, D. Entekhabi, E. Foufoula-Georgiou, H. Gupta, V. Gupta, W. Krajewski, E. Philip Krider, W. K.M. Lau, J. McDonnell, W. Rossow, J. Schaake, J. Smith, S. Sorooshian, and E. Wood, 2009: Climate change: The need to consider human forcings besides greenhouse gases. Eos, Vol. 90, No. 45, 10 November 2009, 413. Copyright (2009) American Geophysical Union.
that there are more first order human climate than just CO2 and a few other greenhouse gases.