Globally Recognized Indicators Sandy Brewer General Motors Corporation Supplier Partnership for the Environment Dublin, Ohio - July 24, 2003

Globally Recognized Indicators Global Reporting Initiative (GRI)* –Environmental Performance Indicators Core Indicators Additional Indicators World Business Council for Sustainable Development (WBCSD)* –Environmental Influence Indicators Generally Applicable and Potential Indicators Business-Specific Indicators –Eco-Efficiency Profile * GM uses the GRI guidelines for public reporting and helped develop the WBCSD indicators, which are not as extensive as those of the GRI.

GRI Environmental Performance Indicators Core Indicators Materials –Types and weights of materials used –Percentage of post-consumer and post-industrial used Energy –Types and joules of energy used –Joules of purchased energy used Water –Total water used Biodiversity –Amount of land held in biodiversity-rich habitats –Major biodiversity impacts associated with activities and/or products and services Compliance –Incidents of and fines for environmental non-compliance

GRI Environmental Performance Indicators Core Indicators (continued) Emissions, Effluents, and Waste –Greenhouse gas emissions –Use and emission of ozone-depleting substances –NOx, SOx, and other significant air emissions, by type –Total amount of waste by type and destination –Significant discharges to water, by type –Number and volume of significant spills of chemicals, oils, and fuels Products and Services –Significant environmental impacts of principle products and services –Percentage by weight of products reclaimable and those actually reclaimed at the end-of-life

WBCSD Environmental Influence Indicators Generally Applicable Indicators Energy –Types and joules of energy purchased and used –Minus energy sold to others Materials –Metric tons of materials used Water –Cubic meters of water used from all sources Ozone Depleting Substance (ODS) Emissions –Metric tons of CFC11 equivalents Greenhouse Gas (GHG) Emissions –Metric tons of CO 2 equivalents

WBCSD Environmental Influence Indicators Potential Generally Applicable Indicators Acidification Emissions to Air –Acid gases and mists emitted to air from fuel combustion, process reactions, and treatment processes Total Waste –Metric tons of substances destined for disposal

Business-Specific Indicators (Examples) Priority heavy metals emissions to surface water –Metric tons of Cu equivalents Waste to landfill - metric tons Waste to incineration - metric tons Photochemical oxidant creation –Metric tons of VOC & NOx or Ethylene equivalents Eutrophication emissions to surface water –Metric tons of phosphorus equivalents Chemical oxygen demand to surface waters –Metric tons of oxygen Packaging - metric tons GHG emissions from purchased electricity –Metric tons of CO 2 equivalents WBCSD Environmental Influence Indicators

Recommended SP Metrics Basic Indicators Energy use in gigajoules Water use in cubic meters Greenhouse gas emissions in CO 2 equivalents Waste in metric tons –Recycled –Non-Recycled Possible Data Source: Voluntary Programs EPA WasteWise program reports State-sponsored pollution prevention program reports

GRI Environmental Performance Indicators (1 of 3) Supplemental Information Source: Sustainability Reporting Guidelines (GRI, 2002)Sustainability Reporting Guidelines (GRI, 2002)

GRI Environmental Performance Indicators (2 of 3) Supplemental Information Source: Sustainability Reporting Guidelines (GRI, 2002)Sustainability Reporting Guidelines (GRI, 2002)

GRI Environmental Performance Indicators (3 of 3) Supplemental Information Source: Sustainability Reporting Guidelines (GRI, 2002)Sustainability Reporting Guidelines (GRI, 2002)

WBCSD Generally Applicable Indicators (1 of 2) Supplemental Information Source: Measuring Eco-Efficiency, A Guide to Reporting Company Performance (WBCSD, 2000)Measuring Eco-Efficiency, A Guide to Reporting Company Performance (WBCSD, 2000)

WBCSD Generally Applicable Indicators (2 of 2) Potential Generally Applicable Indicators (1 of 1) Supplemental Information Source: Measuring Eco-Efficiency, A Guide to Reporting Company Performance (WBCSD, 2000)Measuring Eco-Efficiency, A Guide to Reporting Company Performance (WBCSD, 2000)

WBCSD Eco-Efficiency Profile Supplemental Information Source: Measuring Eco-Efficiency, A Guide to Reporting Company Performance (WBCSD, 2000)