On greenhouse gas intensity

It’s a poor indicator of progress on global warming 11

A recent news article about the Stern Report contained the following gem from a Bush administration spokeswoman:

The statement from spokeswoman Kristen Hellmer said the United States is "well on track to meet the president's goal to reduce greenhouse gas intensity of our economy 18 percent by 2012."

This statement makes it sound like the Bush administration is taking on the problem of climate change head-on, with an aggressive program to reduce emissions.

But it ain't so.

The statement is about greenhouse gas intensity rather than greenhouse gas emissions.

Greenhouse gas intensity is the emissions per unit economic output. Multiply this quantity by the size of the economy and you get total greenhouse gas emissions.

Historically, U.S. greenhouse gas intensity has declined all by itself as our economy has evolved from manufacturing (which takes a lot of energy) to services (which take less), and as equipment has naturally become more efficient. Over the past few decades, greenhouse gas intensity has declined somewhere between 1% and 2% per year.

At the same time, the economy has grown more rapidly than this, so total greenhouse gas emissions have increased.

Several years ago, the Bush administration committed itself to an 18% decrease in greenhouse gas intensity over a decade -- corresponding to a decrease of about 1.8% per year. This represents negligible if any increase in the natural rate of decline.

In other words, they basically committed the U.S. to maintaining the status quo.

Importantly, it is virtually certain that the economy will grow faster than this during the decade, so even if the target is met, greenhouse gas emissions will continue to rise. Considering that we need to reduce emissions by about 80% from today's levels to stabilize atmospheric CO2, achieving the administration's intensity target does nothing to stop global warming.

Andrew Dessler is an associate professor in the Department of Atmospheric Sciences at Texas A&M University; his research focuses on the physics of climate change, climate feedbacks in particular.

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  1. jjwfmme Posted 5:26 am
    31 Oct 2006

    Comment by the atmosphere:

    The atmosphere:

    "You know, those humans were releasing all this CO2, and so I was going to heat up. But then I saw that the humans were like, so intense. Their lawyers, policy wonks and number-crunchers were working really hard. So I gave them a break and suspended the laws of physics."

  2. wacki Posted 11:15 am
    31 Oct 2006

    what?

    18% by 2012?

    I didn't realize our greenhouse gas emissions were projected to decline at that rate.  Given the amount of coal fire power stations we are building I would have expected an increase.  Anyone have any more info on the yearly anthropogenic CO2 emissions and projections?

  3. Andrew Dessler Posted 12:40 pm
    31 Oct 2006

    You're confusing intensity w/ emissions

    Wacki-

    Our emissions are NOT going down.  The emissions intensity is going down.  Our economy is growing fast enough that total emissions are still growing rapidly.

    Regards.

  4. Zarkov Posted 5:30 pm
    31 Oct 2006

    Vacuum

    Do you ever feel that you are screaming into a vacuum?

    But maybe it is best we don't know we are already doomed.

    Good luck guys, see you in " another time, another place, with another face"(Van Morrison)

  5. jjwfmme Posted 10:47 pm
    31 Oct 2006

    If you're going to use the word, use quotes

    Over the past few decades, greenhouse gas intensity has declined somewhere between 1% and 2% per year.

    "Intensity" is such a contrivance of a word that I wouldn't use it without scare quotes. Just using it as if it were legitimate buys into the spin...

  6. JMG's avatar

    JMG Posted 10:55 pm
    31 Oct 2006

    With enemies like these, you know it's good

    (Old pilot saying:  you only get flak when you're over the target.)

    OPEC Says British Climate Change Report "Unfounded"

    http://www.planetark.com/avantgo/dailynewsstory.cfm?newsi...

  7. wedjr Posted 11:30 pm
    31 Oct 2006

    Snow Job

    Tony Snow trotted out exactly this same malarkey yesterday at his press briefing, saying with straight face that the President, contrary to stereotypes, is actively engaged in trying to fight climate change. Transcript here: http://www.whitehouse.gov/news/releases/2006/10/20061031-...

  8. Lab Lemming Posted 7:20 pm
    05 Nov 2006

    confused

    Does GHG intensity improvement mean that global warming has not yet reached the point where it is slowing economic growth?

    -Lab LEmming

  9. ClimateCriminal Posted 10:38 pm
    10 Sep 2007

    Nature Cannot Be Fooled

    Richard Feynman said "Nature cannot be fooled!"

    No amount of mathematical jiggery-pokery will deceive mother nature, even though we humans deceive ourselves!

    Science trumps everything - religion, politics!

  10. amazingdrx Posted 12:29 am
    11 Sep 2007

    Coal to liquid

    Coal to liquid fuel and fuel farming emit more than  twice the GHG per mile driven of fossil fuel.  That will be a huge intensifier of GHG per unit of economic bullshit figuring by wall street/duuhbya friendly liars disguised as economists.

    Not a good result.

    http://amazngdrx.blogharbor.com/blog

  11. amazingdrx Posted 6:09 am
    17 Sep 2007

    Smart fuel cell

    http://www.freep.com/apps/pbcs.dll/article?AID=/20070917/ ...

    A smart fuel cell "island" grid design?  Very good!  and it runs on biogas or natural gas.  That's distributed generation and storage.

    This is the way to really reduce GHG.  Fuel cell/turbines put out half the ghg per unit of energy.

    http://amazngdrx.blogharbor.com/blog

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