MONTANA GREENHOUSE GAS EMISSIONS AND SINKS
INVENTORY: SUMMARY

MT Greenhouse Gas Emissions,
1990 and 2000

Energy	Industrial Agriculture Land Use Waste

Processes

Sector

~ 1990
¦ 2000

The Montana Department of Environment Quality (MTDEQ) report DRAFT
Montana Greenhouse Gas Inventory and Reference Case Projections 1990-2020,
contains an inventory of Montana's greenhouse gas (GHG) emissions from 1990 to
2000.1

Montana is a net sink for GHGs due to its forested lands which comprise 27
percent of the total state land area. In 1990, Montana provided a sink of 12.5 million
metric tons carbon dioxide equivalent (MMTC02E), which decreased by 45 percent to
6.9 MMTC02E in 2000.

Emissions from industrial processes and waste sectors increased by 100 and 50
percent, respectively, between 1990 and 2000. Emissions from agriculture increased by
20 percent in this same time period.

1 Historical GHG emissions estimates (1990 through 2000) were developed using a set of
generally accepted principles and guidelines for state GHG emissions inventories relying to the
extent possible on Montana-specific data and inputs. Many of the inventory estimates came from
the US Environmental Protection Agency's (EPA's) State Inventory Tool.

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1990

C02
(MMTCOzE)

ch4

(MMTC02E)

n2o

(MMTC02E)

HFCs,
PFCs, and

sf6

(MMTC02E)

Total
(MMTCOzE)

Energy

*

*

*

*

29.0

Industrial Processes

*

*

*

*

0.1

Agriculture

*

*

*

*

7.9

Land Use

*

*

*

*

-49.7

Waste

*

*

*

*

0.2

Net Emissions

*

*

*

*

-12.5

2000

C02
(MMTCOzE)

ch4

(MMTCOzE)

NzO
(MMTCOzE)

HFCs,
PFCs, and

sf6

(MMTCOzE)

Total
(MMTCOzE)

Energy

*

*

*

*

32.8

Industrial Processes

*

*

*

*

0.2

Agriculture

*

*

*

*

9.5

Land Use

*

*

*

*

-49.7

Waste

*

*

*

*

0.3

Net Emissions

*

*

*

*

-6.9

Note: Totals may differ from the sum of the sources due to independent rounding. All emissions
are reported in million metric tons of carbon dioxide equivalent (MMTC02E).

* The Montana state Inventory did not include emissions by gas; thus, emissions of all gases,
expressed in C02 equivalents, are presented in the right-most column.

Within the energy sector, an increase in emissions from electricity production (6
percent), the fossil fuel industry (15 percent) and transportation (24 percent) contributed
to the overall energy sector increase of 13 percent. The land use sector remained a
constant sink of 49.7 MMTC02E in both 1990 and 2000.

Per capita gross emissions from Montana were 40 MTC02E for both 1990 and
2000, which is greater than the national average of 25 MTC02E for this same time
period.2

2 The state per capita emissions value is quoted in the Montana Inventory report and is reflective
of Montana's methodological decision to include emissions from electricity consumption in state
rather than electricity production. Therefore, this per capita value subtracts emissions associated
with exported electricity. The national per capita average is the gross emissions level.

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