, 9 tweets, 2 min read
My Authors
Read all threads
Thread: Why are most carbon footprint estimates for livestock products so massive? In short: because they are based on a faulty methane calculation. EAT Lancet, Starbucks, Impossible Burger etc are drastically overestimating GHG from livestock and here is why. /1
Traditionally, the IPCC’s AR5 estimated that the global warming caused by 1 ton of livestock methane would be 28 times that of a ton of carbon dioxide. New research destroys that estimate. /2
Traditional greenhouse gas accounting ignores the impact of changing methane emission rates while grossly exaggerating the impact of steady methane emissions (like from constant cattle herds in most developed countries). /3
Climate policy has traditionally treated every tonne of methane as supposedly “equivalent” to 28 tonnes of carbon dioxide… It isn’t. /4
To find the carbon dioxide emissions that would actually have a similar impact on global temperature as methane, you need to multiply those methane emissions by 7 (not 28), and add the rate of change of methane emissions (measured in tons of methane/year), multiplied by 2100. /5
If there is no “rate of change” (i.e. the quantity of emissions by weight is constant over time) then there is a one-off impact of only 7 times the equivalent weight of CO2 (count only once – there is no accumulation as is the case for CO2 and other long-lived gases). /6
“That this formula is vastly more accurate than the traditional accounting rule is indisputable.” /7
“Even more strikingly, if an individual [cattle or sheep] herd’s methane emissions are falling by one third of one percent per year (that’s 7/2100, so the two terms cancel out) …then that herd is no longer adding to global warming.”
Professor Myles Allen (Oxford University), co-author of IPCC SR1.5.


Missing some Tweet in this thread? You can try to force a refresh.

Enjoying this thread?

Keep Current with Frank Mitloehner

Profile picture

Stay in touch and get notified when new unrolls are available from this author!

Read all threads

This Thread may be Removed Anytime!

Twitter may remove this content at anytime, convert it as a PDF, save and print for later use!

Try unrolling a thread yourself!

how to unroll video

1) Follow Thread Reader App on Twitter so you can easily mention us!

2) Go to a Twitter thread (series of Tweets by the same owner) and mention us with a keyword "unroll" @threadreaderapp unroll

You can practice here first or read more on our help page!

Follow Us on Twitter!

Did Thread Reader help you today?

Support us! We are indie developers!

This site is made by just three indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member ($3.00/month or $30.00/year) and get exclusive features!

Become Premium

Too expensive? Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal Become our Patreon

Thank you for your support!