The Decision and Policy Analysis (DAPA) Program of the International Center for Tropical Agriculture (CIAT) recently released results from a research project on mitigating climate change in Mesoamerican coffee production. You can download a PDF of the report, The Potential of Mesoamerican Coffee Production Systems to Mitigate Climate Change. This document is actually the thesis project of a Dutch student. The paper is a straightforward look at the how different shade coffee systems store carbon and their levels of greenhouse gas emissions, as well as how a few certifications (organic, Rainforest Alliance, UTZ Certified) influence those metrics. A very brief synopsis of the results are in this PDF, and a more graphical overview is given in this presentation (also PDF).
Here are two slides from the presentation to whet your appetite (click to enlarge).
For an explanation of these interesting graphs take a look at the full report. While it is over 100 pages, it is not a difficult read and I especially encourage people to take a look at page 68, which outlines coffee production practices that result in lowered greenhouse gas emissions, and page 70, which gives overall conclusions.