OHIO GREENHOUSE GAS EMISSIONS AND SINKS INVENTORY:

SUMMARY



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Ohio Greenhouse Gas Emissions for 1990

Million Metric Tons of Carbon Equivalent



~ carbon
equivalent



Total Waste Agriculture Industry Land Use
Energy

Sector

The report "Greenhouse Gas Emission Inventory for Ohio" provides a detailed inventory
of greenhouse gas emissions and sinks for Ohio in 1990. Emissions for each source
were estimated primarily using methods from the 1992 guidance document State
Workbook: Methodologies for Estimating Greenhouse Gas Emissions. According
to these estimates, in 1990, Ohio emitted 88.9 million metric tons of carbon equivalent
(MMTCE). Ohio estimated emissions of 18.4 MMTCE from biomass fuels and other
sources. Emissions from these sources are not included in the reported total or table
below.1

The principal greenhouse gas was carbon dioxide, comprising 275 million metric tons
(75.0 MMTCE) in 1990. Other emissions in 1990 included methane with 2.35 million
metric tons (13.5 MMTCE), 0.01 million metric tons of nitrous oxide (0.5 MMTCE) and
1100 MTCE of HFCs.

1 Note that the state of the art emission inventory method has advanced since Ohio completed its
inventory; therefore, we have made the following adjustments to Ohio's emission estimates.

First, we excluded emission estimates for sources not covered by the most recent inventory
guidance (http://www.epa.gov/ttn/chief/eiip/techreport/index.html'). These emissions include
carbon dioxide from biomass fuels and emissions from ozone depleting compounds such as
CFCs, HCFCs, and halons. Second, we used updated values for global warming potentials.

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Ohio 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

5.6

*

*

*

5.6

Energy - Commercial

2.8

*

*

*

2.8

Energy - Industrial

15.7

*

*

*

15.7

Energy - Transport

15.2

*

*

*

15.2

Energy - Utility

31.4

*

*

*

31.4

Energy - Exported Electricity

*

*

*

*

0.0

Energy - Other

5.3

1.0

*

*

6.3

Total Energy

75.9

1.0

*

*

76.9

Waste

0.1

11.2

*

*

11.3

Agriculture

*

1.2

0.5

*

1.7

Industry

0.6

*

*

0.0

0.6

Land Use

-1.6

*

*

*

-1.6

Total

75.0

13.5

0.5

0.0

88.9

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,
and emissions from biofuel combustion are excluded.

The major source of carbon dioxide emissions was fossil fuel combustion (99%), with
minor emissions from cement production, lime manufacture, and waste combustion.
Carbon dioxide sinks (i.e., an increase in forest carbon storage) offset about 2% of the
total carbon dioxide emissions. Sources of methane emissions were landfills (83%),
coal mining (7%), domesticated animals (5%), manure management (3%), and
agricultural residue burning (2%). Nitrous oxide emissions were attributable to
agricultural soil management (88%) and agricultural residue burning (12%). Emissions
of HFCs were due to HCFC-22 production.

Ohio emissions in 1990 were 8.2 MTCE per capita, compared to 1990 U.S. emissions of
6.4 MTCE per capita.

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