The Greenhouse Gas Protocol (GHG Protocol) is the international accounting tool for government and business leaders to understand, quantify, and manage greenhouse gas emissions. The GHG Protocol, is the product of a partnership between the World Resources Institute and the World Business Council for Sustainable Development. It provides the accounting framework for many GHG standards and programs in the world - from the International Standards Organization to The Climate Registry - as well as hundreds of GHG inventories prepared by individual companies. The GHG Protocol offers two different tools for estimating GHG emissions from cement manufacture (WRI 2011):
US EPA tool: A cement-based tool requiring data only on annual cement production. Emissions are calculated using clinker to cement ratios and CaCO3 to raw meal ratios. This tool is based on the U.S. EPA’s ClimateWise program.
CSI tool: A clinker based tool suitable for when the amount of clinker consumed is known.
These tools are accessible here. http://www.ghgprotocol.org/calculation-tools/cement-sector