Forestry companies worldwide are enthusiastically trying to implement the idea of establishing tree plantations in Southern countries under the Clean Development Mechanisms of the Kyoto Protocol, signed in 1997, allegedly as a way of sequestering CO2 from the atmosphere to mitigate the effects of global warming ... and of making good profits at the same time. Even if presented as "environmentally friendly", the whole idea of plantations as carbon sinks is based on weak scientific arguments and does not constitute an effective way of reducing CO2 concentrations in the air.