Charts & Tables

Chevron's net decrease of approximately 2.2 million metric tons of CO₂ equivalent emissions from 2008 to 2009 can be attributed to reduced flaring from Cabinda (Angola), and to Nigerian gas processing shutdowns, shut-in offshore wells and pipeline vandalism. Production decreases at U.S. Midcontinent and Alaska operations, as well as declining demand for products and shutdown of process units at the Richmond, California, refinery, also accounted for the emission reductions. Decreases were offset by increased emissions due to increased production at Tengiz, Kazakhstan, and in the U.S. Gulf of Mexico (particularly resulting from Blind Faith and Tahiti fields' coming onstream), and due to the increased throughput from the Pembroke, United Kingdom, refinery.

Chevron's GHG emissions data are reported on an equity basis for all businesses in which Chevron has an interest except as noted below. The following entities are not currently included in the Chevron corporate greenhouse gas inventory: Chevron Phillips Chemical Co., the Caspian Pipeline Consortium, Azerbaijan International Operating Co., the Chad/Cameroon pipeline joint venture, Caltex Australia Ltd.'s Lytton and Kurnell refineries, and other refineries in which Chevron has an equity interest of 16 percent or less. These are entities over which Chevron does not have full operational control or which do not generally follow Chevron's corporate GHG inventory protocol or a compatible protocol.

Due to rounding, individual numbers may not sum to the total numbers.

Chevron's net decrease of approximately 2.2 million metric tons of CO₂ equivalent emissions from 2008 to 2009 can be attributed to reduced flaring from Cabinda (Angola), and to Nigerian gas processing shutdowns, shut-in offshore wells and pipeline vandalism. Production decreases at U.S. Midcontinent and Alaska operations, as well as declining demand for products and shutdown of process units at the Richmond, California, refinery, also accounted for the emission reductions. Decreases were offset by increased emissions due to increased production at Tengiz, Kazakhstan, and in the U.S. Gulf of Mexico (particularly resulting from Blind Faith and Tahiti fields' coming onstream), and due to the increased throughput from the Pembroke, United Kingdom, refinery.

Chevron's GHG emissions data are reported on an equity basis for all businesses in which Chevron has an interest except as noted below. The following entities are not currently included in the Chevron corporate greenhouse gas inventory: Chevron Phillips Chemical Co., the Caspian Pipeline Consortium, Azerbaijan International Operating Co., the Chad/Cameroon pipeline joint venture, Caltex Australia Ltd.'s Lytton and Kurnell refineries, and other refineries in which Chevron has an equity interest of 16 percent or less. These are entities over which Chevron does not have full operational control or which do not generally follow Chevron's corporate GHG inventory protocol or a compatible protocol.

Due to rounding, individual numbers may not sum to the total numbers.

1. We improve our methodology and scope for reporting global emissions to air annually, making year-to-year comparisons difficult. Our focus is to continually improve our reporting practices.

2. Volatile organic compounds (VOCs) derive primarily from fugitive emissions from equipment (such as valves, pumps and compressors), flaring and venting, and flashing gas. Nitrogen oxides (NOx) and sulfur oxides (SOx) occur during combustion.

3. During 2009, improvements in estimation methodologies in several reporting units resulted in variances in reported emissions compared with 2008.

Global VOC emissions were higher than in 2008 primarily due to the Nigeria/Mid-Africa business unit's improved estimation of vented gas volumes, the Eurasia business unit's replacement of default emissions factors with locally specified data, and Global Marketing's estimation of storage tank and loading emissions for the first time. This gain was partially offset by reductions due to improved reporting by the Asia South business unit and decreased production in Alaska, United States.

Global SOx emissions were higher than in 2008, mainly due to the Eurasia business unit's improved reporting and to the Partitioned Zone (between Saudi Arabia and Kuwait) business unit's increased sour gas production and improved reporting of gas production and flaring..

Global NOx emissions were lower than in 2008, mainly due to improved reporting by the IndoAsia business unit and the completion in 2008 of a drilling program at Indonesia geothermal and power operations.

U.S. Refining (Manufacturing) data on emissions to air are no longer additionally reported separately, as this report is enterprisewide and global in nature.

Global Gas, previously reported as "other," was included with Upstream in 2009. "Other" includes Chemicals, Chevron Business and Real Estate Services, Chevron Mining Inc., Chevron Environmental Management Co., and Corporate Aviation.

Due to rounding, individual numbers may not sum to the total numbers.

Secondary containment volume — which is not released to the environment — is included in the total volume listed at the end of each bar. Approximately 14 percent, or 1,289 barrels, of the total volume was spilled to secondary containment in 2009.

All spills to water are included. Spills to land and secondary containment that are greater than or equal to one barrel are included.

Global Upstream average oil concentration in discharges to water decreased in 2009, mainly due to additional well-injection capacity, which allowed the Partitioned Zone business unit to cease discharging produced water as of June 2009. Manufacturing and Chemicals average oil concentration in discharges to water increased, mainly due to a process upset and wastewater-treatment maintenance issues at our Pascagoula, Mississippi, refinery. A new effluent treatment plant at Pascagoula came fully on line in November 2009.