As the UNFCCC moves towards new arrangements under the Durban Platform, facilitating trust among its Parties will be vital to enabling and encouraging States to stabilise their greenhouse gas (GHG) emissions and prevent dangerous levels of climate change. An effective and positive monitoring system can be an important part of building mutual trust between Parties to an international Convention, increasing confidence that all Members will fulfill their obligations by providing support for implementation while also identifying areas of non-compliance. This paper is a contribution by the Quaker United Nations Office to a discussion on what effective monitoring under the UNFCCC and its Protocols might look like, offering a small sample of approaches adopted by other international bodies and discussing some of the merits of each.