Martin Persson is an Associate Professor at Physical Resource Theory, Department of Space, Earth & Environment at Chalmers University of Technology, Sweden. In addition to greenhouse gas metrics, his research focuses on the role of agricultural production, trade and consumption in driving tropical deforestation, as well as policies for halting the loss of forests.

This blog-post from Martin Persson at Chalmers University of Technology in Sweden takes on the timely question of how one should measure the climate impacts of different greenhouse gases.  He begins by explaining what the two most common metrics - Global Warming Potential (GWP) and the Global Temperature change Potential (GTP) – actually measure.  He then moves on to focus specifically on beef and associated methane emissions. In light of the Paris Agreement’s target of limiting warming to 2oC he argues that the ‘right’ metric to choose needs to reflect the specific climate policy that the measurement is to serve.Martin Persson is an Associate Professor at Physical Resource Theory, Department of Energy & Environment at Chalmers University of Technology in Sweden. In addition to metrics, his research focuses on global land use in relation to climate, biodiversity, and conservation policy. In a recent paper he and his colleagues show that the consumption and international trade of beef, soy, palm oil and timber products are dominant causes of deforestation in the tropics.