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Why Not to Worry about Farming’s Contribution to Global Warming

by E. Calvin Beisner

March 4, 2024

For decades the primary way environmentalists concerned about manmade global warming have advocated to slow it has been to reduce human emissions of the “greenhouse gas” carbon dioxide (mainly from burning coal, oil, and natural gas for energy). Lately they have focused increasingly on contributions from two other “greenhouse gases,” primarily from agriculture—methane (CH4) from livestock flatulence, and nitrous oxide (N2O) from chemical fertilizers.

Why? Because CH4’s forcing effect (the amount of infrared radiation, or heat, each molecule in the atmosphere impedes from escaping from Earth’s surface to space, thus warming the surface) is 30 times, and N2O’s 230 times, that of CO2, as illustrated here:

Why? Because almost all the outgoing longwave radiation (infrared) in the frequency bands CO2 can absorb has already been absorbed—by both CO2 and water vapor (H2O)—while far less in the bands CH4 and N2O can absorb has already been absorbed. So we say CO2’s bands are nearly “saturated,” while CH4’s and N2O’s are nearly “transparent.”

So, it looks like we should be much more concerned about N2O than about CO2 or even CH4. Or should we?

The rate at which we’re adding CO2 to the atmosphere is about 3000 times that at which we’re adding N2O, and 30 times that at which we’re adding CH4, as illustrated here:

Consequently—because CO2’s rate of increase in the atmosphere is so much faster than CH4’s or N2O’s—the contribution to forcing (and so to global average temperature) from CO2 is about 10 times that from CH4 and 13 times that from N2O, as illustrated here:

So, should we reduce CH4 and N2O emissions (by reducing agricultural production) to slow global warming?

As atmospheric physicist and MIT emeritus professor of meteorology Richard Lindzen put it in a talk to Irish beef farmers February 27, “shutting down emissions of CH4 and N2O globally (forget little Ireland) will have no discernible impact on the climate metric regardless of what you believe about global warming and which model you are using.”

Dated: March 4, 2024

Tagged With: Climate Change, CO2, Farming, Fossil Fuels, Global Warming, methane, N2O, Nitrous Oxide
Filed Under: Agricultural Chemicals, Bridging Humanity and the Environment, Climate Policy, Environmental Economics, Farming Methods, Featured, Food Ethics

About E. Calvin Beisner

Dr. Beisner is Founder and National Spokesman of The Cornwall Alliance; former Associate Professor of Historical Theology & Social Ethics, at Knox Theological Seminary, and of Interdisciplinary Studies, at Covenant College; and author of “Where Garden Meets Wilderness: Evangelical Entry into the Environmental Debate” and “Prospects for Growth: A Biblical View of Population, Resources, and the Future.”

Comments

  1. Dan Pangburn says

    March 11, 2024 at 5:15 pm

    Water vapor has been increasing about 1.43% per decade since before 1988. What is the forcing per molecule for water vapor?

    Reply

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Future Speaking Engagements

May 23, 2025 – Grand Rapids, MI

GR.Church, 4525 Stauffer Avenue Southeast, Grand Rapids, MI 49508

Dr. E. Calvin Beisner, Cornwall Alliance President, and Steve Goreham, Cornwall Alliance Board Member, will hold a symposium on Sustainable Energy, Climate Change, and the costs to YOUR life.  For tickets and more information, click HERE.

June 18-21, 2025–Dallas, TX

Cornwall Alliance will be a host of the Association of Classical Christian Schools’ (ACCS) annual Repairing the Ruins conference in Dallas, TX, and will have an exhibit booth.

Details and registration can be found HERE.

September 19-20–Arlington, VA

Dr Beisner will represent the Cornwall Alliance at the fall meeting of the Philadelphia Society and will have a literature table.

Attendance is for Society members and invited guests only. To inquire about an invitation, email Dr. Cal Beisner: Calvin@cornwallalliance.org.

September 26-27– Lynchburg, VA

Dr. Beisner will be speaking at the Christian Education Initiative Annual Summit, “Advancing Christ’s Kingdom Through Biblical Worldview Education.” 

Details and registration can be found HERE.

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