IEA Bioenergy Task 40: Sustainable International Bioenergy Trade , commonly abbreviated Task 40 , was established under the International Energy Agency (IEA) Bioenergy Implementing Agreement in December 2003 with the aim of focusing on international bioenergy technology potential, barriers, and trade wider implications.  Task 40 develops sustainable biomass markets, leading to a stable global commodity market in biomass energy. 
- Jump up^ Developments in international bioenergy trade, Junginger et al., Biomass and Bioenergy, 2008.
- Jump up^ “About Task 40” . IEA Bioenergy . Retrieved 28 December 2014 .