Land use

Description Simulates impact of emission reductions resulting from decreases in deforestation and increased carbon sequestration resulting from aforestation (proposalting of trees on land where forests formerly existed).

Input variables
Deforestation

* Parameter value of 1 assumes continued constant future emissions from deforesation of 1.5 billion tons of carbon per year * Parameter value of 0 assumes 90% reduction in deforestation by 2050, to 0.15 billion tons of carbon per year

Aforestation

* Parameter value of 1 assumes, under the BAU scenario, increased sequestration resulting from aforestation of 1.3 billion tons of carbon in 2030, decreasing to 0.7 tons of carbon in 2100 * Parameter value of 0 assumes no increased sequestration resulting from aforestation

Key assumptions
Deforestation

* Parameter value of 1 based on continuation of BAU levels of deforestation * Parameter value of 0 based on nearly complete eradication of land use practices that result in deforestation (90% reduction)

Aforestation

* Paramter value of 0 based on no increase in tree proposalting * Parameter value of 1 based on achieving maximum level of aforestation projected as being feasible by the IPCC

Output variables

* Future emissions from deforesation (feeds into Carbon cycle module) * Future sequestration from aforesation (feeds into Carbon cycle module)