Connecticut Greenhouse Gas Emissions and Sinks Inventory Summary 1990 Through 2000

CONNECTICUT GREENHOUSE GAS EMISSIONS AND SINKS
INVENTORY: SUMMARY

=igure 1. CT Greenhouse Gas Emissions, 1990 through 2000

ILI

CT Greenhouse Gas Emissions
1990 through 2000

14.0
12.0
10.0 -\
8.0
6.0
4.0
2.0
0.0
-2.0

¦ Land Use

~ Waste

~ Agriculture

~ Industry

~ Energy

1990 1991 1992 1993 1994 1995 1996 1997 199S 1999 2000

Year

The Connecticut Greenhouse Gas Inventory: 1990 to 2000 provides a detailed inventory of
sources and sinks of greenhouse gases in Connecticut.1 In 1990 Connecticut emitted
greenhouse gases in the amount of 11.4 million metric tons of carbon equivalent (MMTCE). In
2000, emissions were 12.7 MMTCE, an overall increase of 11 percent over 1990 emissions.
Emissions from industrial processes2 changed the most on a percentage basis over the time
period, increasing 167 percent. Emissions from energy also increased (10 percent). Emissions
from agriculture and waste both decreased (1 percent and 10 percent, respectively). Forestry
and land use change accounted for a small sink, the magnitude of which decreased from -0.7
MMTCE in 1990 to -0.6 MMTCE in 2000.

1 Emissions were estimated using the 2003 version of the EPA State Inventory Tool (SIT), developed as
part of the U.S. EPA's Emission Inventory Improvement Program (EIIP). The Connecticut Greenhouse
Gas Inventory: 1990-2000 was developed by Northeast States for Coordinated Air Use Management
(NESCAUM), Connecticut Department of Environmental Protection, and Connecticut Clean Energy Fund.

2 Connecticut estimated only high GWP emissions from the industrial processes sector. Connecticut
notes that small amounts of C02 emissions are generated as well, in limestone and dolomite and soda
ash use, but these emissions were not estimated.

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Table 1. CT Greenhouse Gas Emissions by Gas and by Sector, 1990 through 2000

MMTCE

1990

1991

1992

1993

1994

1995

1996

1997

1998

1999

2000

C02

10.1

9.9

9.9

9.8

9.6

9.5

10.5

11.4

11.3

11.4

11.4

Energy

10.6

10.4

10.4

10.1

9.9

9.8

10.8

11.6

11.5

11.7

11.7

Industrial Processes

*

*

*

*

*

*

*

*

*

*

*

Land Use

-0.7

-0.7

-0.7

-0.6

-0.6

-0.6

-0.6

-0.5

-0.5

-0.6

-0.6

Waste

0.2

0.2

0.2

0.2

0.3

0.2

0.3

0.3

0.3

0.3

0.3

ch4

0.8

0.8

0.8

0.8

0.8

0.8

0.6

0.6

0.6

0.6

0.5

Energy

0.2

0.2

0.1

0.2

0.2

0.2

0.2

0.2

0.2

0.2

0.2

Agriculture

*

*

*

*

*

*

*

*

*

*

*

Land Use

*

*

*

*

*

*

*

*

*

*

*

Waste

0.6

0.6

0.6

0.6

0.6

0.6

0.4

0.4

0.4

0.3

0.3

N20

0.4

0.4

0.4

0.4

0.5

0.5

0.5

0.5

0.5

0.5

0.4

Energy

0.2

0.2

0.2

0.2

0.2

0.2

0.2

0.2

0.2

0.2

0.2

Industrial Processes

*

*

*

*

*

*

*

*

*

*

*

Agriculture

*

*

0.1

0.1

0.1

0.1

*

*

0.1

0.1

0.1

Land Use

*

*

*

*

*

*

*

*

*

*

*

Waste

0.2

0.2

0.2

0.2

0.2

0.2

0.2

0.2

0.2

0.2

0.2

HFCs, PFCs, and SFs

0.1

0.1

0.1

0.1

0.1

0.1

0.2

0.2

0.2

0.2

0.2

Industrial Processes

0.1

0.1

0.1

0.1

0.1

0.1

0.2

0.2

0.2

0.2

0.2

Net Emissions

11.4

11.2

11.2

11.1

10.9

10.9

11.8

12.7

12.6

12.6

12.7

Note: Totals may differ from the sum of the sources due to independent rounding.

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

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

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Carbon dioxide (C02) accounted for the majority of Connecticut's emissions. These emissions
were mostly due to the burning of fossil fuels, primarily for transportation; electricity production;
and energy consumption in the residential sector. Methane (CH4) was the second largest
contributor to Connecticut's emissions in 1990 and in 2000, equal to 0.8 and 0.5 MMTCE
respectively. Methane emissions decreased slightly over the time period; these emissions
resulted from the anaerobic decay of solid waste in landfills and, to a lesser extent, emissions
from natural gas and oil systems. Nitrous oxide (N20) emissions were fairly constant,
amounting to 0.4 MMTCE in 1990 and 2000, and were mostly from mobile source combustion
and waste combustion. Hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur
hexafluoride (SF6) each comprised a small share of the total emissions. These emissions
increased from 0.1 to 0.2 MMTCE between 1990 and 2000. This increase in HFC/PFC/SF6
emissions is largely due to the replacement of ozone-depleting substances (CFCs) with HFCs,
which have high global warming potentials.

Per capita emissions were 3.5 MTCE in 1990 and 3.7 MTCE in 2000. In both years,
Connecticut's per capita emissions were well below the national average, which was 6.5 MTCE
per capita in 1990 and 6.6 MTCE per capita in 2000.

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