Task 45 is a new task under IEA Bioenergy with its first triennium of activities during 2019-2021. The objective of Task 45 is to identify and address critical issues related to the climate and other sustainability effects of bioenergy and biobased products and systems. The aim is to promote sound development for bioenergy as an integral component of the overall bioeconomy. This objective will be achieved by providing analyses that support well-informed decisions by land owners, communities, businesses, governments and others. A key goal is to increase understanding of the environmental, social and economic impacts of producing and using biomass for bioenergy, within the broader bioeconomy. A central aspect concerns the development and application of science-based methodologies and tools for assessing the effects of biobased systems.