Pressure Points CORRECTION
1Watts, Jonathan. (2019, July 24). ‘No doubt left’ about scientific consensus on
global warming, say experts. Retrieved from https://www.theguardian.com/
science/2019/jul/24/scientific-consensus-on-humans-causing-global-warmingpasses
99
2Willeit, M. et al. Mid-Pleistocene transition in glacial cycles explained by declining
CO2 and regolith removal. Science Advances. 2019; 5: eaav7337
3 IPCC, 2018: Global warming of 1.5°C.
4 IPCC, 2014: Fifth Assessment Report.
5 Environmental Protection Agency (2017, February 14). Understanding Global
Warming Potentials. Retrieved from https://www.epa.gov/ghgemissions/understanding
global-warming-potentials
6Hodnebrog, Ø et al. Lifetimes, direct and indirect radiative forcing, and global
warming potentials of ethane (C2H6), propane (C3H8), and butane (C4H10).
Atmos. Sci. Lett. 2018;19;e804
7 IPCC, 2014: Fourth Assessment Report
8 U.S. Department of State. (2019, February 11). The Montreal Protocol on
Substances that Deplete the Ozone Layer. Retrieved from https://www.state.
gov/key-topics-office-of-environmental-quality-and-transboundary-issues/themontreal
protocol-on-substances-that-deplete-the-ozone-layer/
9 Ratification Status of the Kigali Amendment to the Montreal Protocol on Substances
that Deplete the Ozone Layer retrieved from http://kigali-amendment.
openclimatedata.net/
10 Mexichem Fluor, Inc. v. EPA, 866 F.3d 451 (D.C. Circ. 2017)
10 Mexichem Fluor, Inc. v. EPA, No. 17-1024 (D.C. Cir. Apr. 5, 2019) Spray
October 2019 Spray 31
Continued from page 10
Editor’s note: Apologies to the author, as both the superscripting and
subscripting “failed to launch” in the GWP Values chart found in the
September edition of Pressure Points. On left is the correct version:
Global Warming Potential Values
Lifetime
Lifetime
(years)
Chemical
Common Name Chemical Formula
Methane CH4 12.44 284
Nitrous Oxide N2O 1214 2654
Propane C3H8 0.0363 3.34
Butane C4H10 0.0196 47
Dimethyl Ether CH3OCH3 0.0157 17
CFC-11 CCl3F 454 4,6604
CFC-12 CCl2F2 1004 10,2004
CFC-113 CCl2FCClF2 854 5,8204
CFC-114 CClF2CClF2 1904 8,5904
HCFC-22 CHClF2 11.94 1,7604
HCFC-141b CH3CCl2F 9.24 7824
HCFC-142b CH3CClF2 17.24 1,9804
HCFC-225ca CHCl2CF2CF3 1.94 1274
HCFC-225cb CHClFCF2CClF2 5.94 5254
HFC-125 CHF2CF3 28.24 3,1704
HFC-134a CH2FCF3 13.44 1,3004
HFC-152a CH3CHF2 1.54 1384
HFC-227ea CF3CHFCF3 38.94 3,3504
HFC-365mfc CH3CF2CH2CF3 8.74 8044
HFC-43-10-mee CF3CHFCHFCF2CF3 16.14 1,6504
HFO-1234ze CF3CH=CHF 0.0454 < 14