It means “land use, land-use change and forestry”. The LULUCF activities eligible under the clean development mechanism are those that promote the removal of carbon dioxide from the atmosphere, i.e., afforestation and reforestation.
Entry into force
Intergovernmental agreements, including protocols and amendments, are not legally valid until ratified by a certain number of countries. For the UNFCCC creation, it took 50 countries; as for ratifying the Kyoto Protocol, at least 55 countries were required...