National Greenhouse Gas Emissions Inventory and Registry Act of 2003 - Amends the Clean Air Act to require the Administrator of the Environmental Protection Agency to establish and administer: (1) a national greenhouse gas emissions information system to collect annual lists required to be submitted under this Act of an entity's greenhouse gas emissions and their sources; and (2) a national greenhouse gas registry to collect voluntarily reported information on emissions reductions.
Directs the Administrator and the Secretaries of Commerce, Agriculture, and Energy to develop greenhouse gas emissions quantification and verification protocols, electronic reporting methods, and accounting and reporting standards.
Requires the Administrator to publish an annual national greenhouse gas emissions inventory.
Expresses the sense of Congress that the United States should demonstrate international leadership and responsibility concerning the risks posed by climate change through meaningful reductions in greenhouse gas emissions and participation in international efforts, including treaties.
Rio Agreement Commission Establishment Act - Establishes the Commission to Implement the Rio Agreement (concerning greenhouse gas emission reductions).
Addresses greenhouse gas emissions issues through: (1) a national assessment of climate change impacts; (2) a review of emission reduction policies and measures; (3) environmental impact statements; (4) an emissions goal; (5) corporate environmental disclosure; (6) methodology for measuring emissions from imports; (7) a review of trade and innovation effects; (8) emissions reduction grants; and (9) modifications to revenue statutes.