OREGON GREENHOUSE GAS EMISSIONS AND SINKS INVENTORY:

SUMMARY

Oregon Greenhouse Gas Emissions for 1990

Million Metric Tons of Carbon Equivalent

18.0-
16.0-
14.0-

tfl

§ 12.0-
•*-»
o

10.0-

•*-»

0)

^ 8.0-

0

1	6.0-
4.0-
2.0-
0.0-

Total Energy

Waste

Agriculture
Sector

Industry

Land Use

~ carbon
equivalent



The report "Report on Reducing Oregon's Greenhouse Gas Emissions" provides a
detailed inventory of greenhouse gas emissions and sinks for Oregon in 1990. The
majority of emissions were estimated using methods from EPA's 1992 guidance
document State Workbook: Methodologies for Estimating Greenhouse Gas
Emissions. In 1990, Oregon emitted 19.9 million metric tons of carbon equivalent
(MMTCE). Oregon estimated emissions of less than 0.1 MMTCE from other sources
not included in the workbook. Emissions from these sources are not included in the
reported total or the table below.1

The principal greenhouse gas was carbon dioxide, comprising 66.9 million metric tons
(18.2 MMTCE). Other emissions included 0.2 million metric tons of methane (1.3
MMTCE), 700 metric tons of nitrous oxide (0.1 MMTCE), and approximately 100 metric
tons of perfluorocarbons (PFCs) (0.2 MMTCE).

1 Note that the state of the art emission inventory method has advanced since Oregon completed
its inventory; therefore, we have made the following adjustments to Oregon's emission estimates.
First, we excluded emission estimates for sources not covered by the most recent inventory
guidance (http://www.epa.gov/ttnchie1/eiip/techrep.htrrtfareen). These emissions include
methane from electric utilities and carbon dioxide from calcium hydrate manufacturing. Second,
we used updated carbon coefficients for some fuel types. Third, we used updated values for
global warming potentials.

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Oregon Greenhouse Gas Emissions for 1990

BY SECTOR

C02
(MMTCE)

Methane
(MMTCE)

Nitrous Oxide
(MMTCE)

HFCs, PFCs,
and SF6
(MMTCE)

Total GHG
Emissions
(MMTCE)

Energy - Residential

0.3

*

*

*

0.3

Energy - Commercial

0.3

*

*

*

0.3

Energy - Industrial

0.9

*

*

*

0.9

Energy - Transport

5.6

*

*

*

5.6

Energy - Utility

4.4

*

*

*

4.4

Energy - Exported Electricity

4.4

*

*

*

4.4

Energy - Other

1.0

0.1

*

*

1.1

Total Energy

17.0

0.1

*

*

17.0

Waste

*

0.6

*

*

0.6

Agriculture

*

0.6

0.1

*

0.7

Industry

0.2

*

*

0.2

0.4

Land Use

1.1

*

*

*

1.1

Total

18.2

1.3

0.1

0.2

19.9

All emissions are reported in million metric tons of carbon equivalent (MMTCE).

An asterisk (*) indicates that emissions of the gas from this sector were zero, insignificant, or not reported.

Emissions due to coal mining and extraction of natural gas and oil are included in the energy - other
figures.

The major source of carbon dioxide emissions was fossil fuel combustion (93%), with
minor emissions from deforestation (6%), aluminum production (<1%), cement
production (<1%), and lime production (<1%). Contributors to methane emissions were
landfills (47%), domesticated animals (38%), manure management (9%), natural gas
production (6%), and burning of agricultural waste (<1%). Nitrous oxide emissions were
accounted for by fertilizer use, and perfluorocarbon emissions were accounted for by
aluminum production.

Oregon's emissions in 1990 were 7.0 MTCE per capita, compared to 1990 U.S.
emissions of 6.4 MTCE per capita.

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