|
Carbon Dioxide Concentration |
|
Year |
parts per million |
|
1960 |
317 |
|
2000 |
369 |
|
|
Methane |
|
Year |
parts per billion |
|
1986 |
1617 |
|
2001 |
1714 |
|
|
Nitrous Oxide |
|
Year |
parts per billion |
|
1978 |
299 |
|
2001 |
315 |
|
|
Carbon Tetra Chloride |
|
Year |
parts per trillion |
|
1978 |
88 |
|
2001 |
94 |
|
SOURCE:
Carbon
Dioxide Information Analysis Center,
ALE/GAGE/AGAGE Network
Greenhouse and Ozone-
Depleting Gases Study
18" diameter x 3" (freestanding)
found metal and glass
Brent Bukowski 2005
Pat Forsyth photo |
