This section describes the IPCC, how it was established and the scope of its works. The IPCC conducts an assessment of published literature; it does not conduct research or monitoring; it aims to present balanced scientific information and reports of relevant policy. It produces guidelines for conducting inventory of greenhouse gas emissions by sectors. Over a 20-year period, IPCC guidelines have evolved considerably. In the 2013 Supplement to 2006 Guidelines, the methodologies are more specific, encompassing various land-use activities on wetlands.