Annual Carbon Flux from Land-Use Changes, 1850-2000. Houghton, 2005

Annual emissions of carbon from changes in land use (Note P = 1015).20 Virtually all of the carbon released to the atmosphere from land use changes now comes from the tropics. Tropical deforestation, including logging and the permanent and temporary conversion of forests to croplands and pastures, releases about 1-2 PgC/yr. This is 15-35% of annual fossil fuel emissions during the 1990s (adding in all the other gases that result from land use change e.g. methane, nitrous oxide etc., tropical deforestation accounts for about 25% of the total anthropogenic emissions of greenhouse gases). Africa contributes about 0.12-0.35 PgC/year.

The science of climate change in Africa: impacts and adaptation [pdf] [20] R. A. Houghton. Tropical deforestation as a source of greenhouse gas emissions. In P. Moutinho and S. Schwartzman (eds.) Deforestation and Climate Change, Amazon Institute for Environmental Research, 13-21, 2005. [pdf]