The World Input-Output Database aims to develop databases, accounting frameworks and models to increase our understanding of the increasingly pressing trade-offs between socio-economic and environmental developments. The core of the database will be a set of harmonized supply and use tables, alongside with data on international trade in goods and services. These two sets of data will be integrated into sets of intercountry input-output tables. Taken together with extensive satellite accounts with environmental and socio-economic indicators, these industry-level data provide the necessary input to several types of models that can be used to evaluate policies aimed at striking a suitable balance between growth, environmental degradation and inequality across the world.