Charts & Tables

Chevron's net decrease of approximately 0.8 million metric tons of CO₂- equivalent emissions from 2007 to 2008 can be attributed primarily to reduced flaring accounting for 1 million metric tons at the Cabinda (Angola) and Nigeria operations. Flare reductions in Nigeria are attributed to the Escravos Gas Plant facility and shutdowns caused by sabotage to pipelines. Continuing energy efficiency improvements also helped to minimize growth in emissions. Additional significant reduction of GHG emissions is attributed to decreased production in the U.S. Gulf of Mexico and California. Chevron Shipping Co. also lowered its emissions. Decreases were offset by emissions from a new deepwater operation in Nigeria; increased GHG emissions from Chevron's share of the Yeosu Refinery in South Korea, which saw a new heavy oil unit come onstream; increased throughput at Chevron's Richmond Refinery; and increased production from Chevron's U.S. midcontinent upstream operations.

Chevron's 2007 emissions have been restated to 60.4 million metric tons of CO₂ equivalent from 60.7 million metric tons due to a correction in data primarily from two business units.

Chevron's 2008 GHG emissions data are reported on an equity basis for all businesses in which Chevron has an interest except where noted as follows. The following entities are not currently included in the Chevron corporate GHG inventory: Chevron Phillips Chemical Co., the Caspian Pipeline Consortium, the 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 0.8 million metric tons of CO₂- equivalent emissions from 2007 to 2008 can be attributed primarily to reduced flaring accounting for 1 million metric tons at the Cabinda (Angola) and Nigeria operations. Flare reductions in Nigeria are attributed to the Escravos Gas Plant facility and shutdowns caused by sabotage to pipelines. Continuing energy efficiency improvements also helped to minimize growth in emissions. Additional significant reduction of GHG emissions is attributed to decreased production in the U.S. Gulf of Mexico and California. Chevron Shipping Co. also lowered its emissions. Decreases were offset by emissions from a new deepwater operation in Nigeria; increased GHG emissions from Chevron's share of the Yeosu Refinery in South Korea, which saw a new heavy oil unit come onstream; increased throughput at Chevron's Richmond Refinery; and increased production from Chevron's U.S. midcontinent upstream operations.

Chevron's 2007 emissions have been restated to 60.4 million metric tons of CO₂ equivalent from 60.7 million metric tons due to a correction in data primarily from two business units.

Chevron's 2008 GHG emissions data are reported on an equity basis for all businesses in which Chevron has an interest except where noted as follows. The following entities are not currently included in the Chevron corporate GHG inventory: Chevron Phillips Chemical Co., the Caspian Pipeline Consortium, the 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 no longer uses the Chevron Energy Index to report externally on energy efficiency due to a recalibration in 2007 that makes year-to-year comparisons inaccurate. The company is now reporting energy efficiency expressed as a percentage improvement from 1992.

1. 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.

2. Global VOC emissions were significantly lower than in 2007, mainly due to reduced cold venting in Indonesia upstream operations, improved estimation methods in PNZ (Partitioned Neutral Zone between Saudi Arabia and Kuwait) operations, decreased flaring at the Escravos Gas Plant in Nigeria, reduced production caused by hurricanes in the U.S. Gulf of Mexico, and reduced burning of gas oil in Argentina.

In 2009, Chevron's Corporate Health, Environment and Safety organization is updating the VOC and Criteria Pollutants Protocol, which will standardize emissions estimation methodology for all operating units across the corporation.

Global SOx emissions were 36 percent higher than in 2007, mainly due to increased sour gas production from the maturing Eocene reservoir in the PNZ, and to improved measurement of gas production and improved calibration of flare gas meters in PNZ upstream operations.

Global SOx emissions from manufacturing helped offset the overall SOx emissions increase. The decreases were mainly due to flaring system improvements at the Pascagoula (Mississippi), El Segundo (California) and Hawaii facilities, as well as the estimation method changes at the Salt Lake (Utah) facility.

Global NOx emissions were lower than in 2007, mainly due to manufacturing: improved estimation factors at the Pembroke (United Kingdom) facility, and the startup of a flare-vapor recovery system at the Hawaii facility.

Global NOx emissions from upstream operations decreased due to a correction of 2007 estimations in Chevron Nigeria Ltd. onshore operations. However, this was offset by an emissions increase in shipping operations due to estimation improvements.

1. 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.

2. U.S. Refining NOx and SOx emissions decreased mainly due to improvements at the Pascagoula (Mississippi) facility.

Secondary containment volume — which is not released to the environment — is included in the total volume listed at the end of each bar. Approximately 27 percent, or 4,636 barrels, of the total volume was spilled to secondary containment in 2008. The volume of controllable petroleum spills increased by 8,247 barrels over 2007 volume, including 1,105 barrels of hurricane-related spills and 1,488 barrels associated with sabotage.