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It contains raw materials, intermediate products, and by-products.Bilateral statistics are critical to understanding global resource trade, but existing data are often difficult to access and use.However, it does present several challenges for users focusing on resource trade, which the CHRTD and the site address: The Chatham House Resource Trade Database reorganizes data around natural resources.As the IMTS and HS systems contain all types of traded goods - including manufactured goods - analysing natural resource trade flows in UN Comtrade typically requires amalgamating a variety of HS codes.Data points that are deemed unreliable and irreconcilable are labelled as such and quarantined.A manual process of reviewing some of the larger flows that have been excluded from the database by this process allows us to reintroduce important flows at the global level, using external sources where necessary.The CHRTD is subject to the same data gaps and weaknesses as are apparent in other sources of international merchandise trade data.

The trade data on this site are from the Chatham House Resource Trade Database (CHRTD).

The cradle-to-gate system boundary accounts for emissions generated throughout the production phase of a product's lifecycle, including the production of inputs, up until the factory gate, i.e. This contrasts with alternative system boundaries such as gate-to-gate, cradle-to-grave (including the use and disposal phases of the product) and cradle-to-cradle (including recycling).

The cradle-to-gate carbon intensity factors assume that all production inputs are sourced domestically, i.e.

They are world-average, cradle-to-gate factors, defined in physical terms (kg CO/kg product).

Sato (2014) presents a detailed discussion, and sensitivity test, of the advantages and disadvantages of using world average factors relative to country-specific factors.

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