Showing posts with label methane. Show all posts
Showing posts with label methane. Show all posts

An Inconvenient Ruminant

The inconvenient ruminant in question is the North American Bison, colloquially known as an American Buffalo.

An American Bison [wikipedia: Jack Dykinga]
The American Buffalo is a potent symbol in the USA and Canada. They have been called Buffalos since the very first European settlers arrived in the mid 1600’s and generally that is what they are known as today.

In fact there are two different subspecies of American Buffalo. The Plains Bison and the Wood Bison. Both are large animals with the Woods Bison being among the biggest of bovine animals in the world and certainly the biggest land animal in the Americas

The American Bison is undoubtedly a magnificent wild beast. But as a species they presents a bit of a problem for Vegan and other Climate Change fanatics like Extinction Rebellion. These are the people who are seeking to reduce/ban/outlaw meat eating on some half-baked delusion that disavowing meat and substituting (say) Mung beans will save the planet.

Let me tell you (with help from the history of the American Bison) why they are wrong.

But first let us just review what exactly the argument against meat production is, and why it is actually deeply flawed even without bringing the American Bison into the argument.

The general attack on the livestock industry these days centres around Climate Change and a blinkered mindset that somehow has convinced itself that animal husbandry is a "bad thing"

The main thrust of the Vegan/Extinction Rebellion argument is that domestic ruminants (mainly cattle) emit large quantities of methane. Methane is a known greenhouse warming gas with an immediate impact. Initially this impact is many times the forcing impact of an equivalent amount of Carbon Dioxide.

So you would think that the more cattle you had then the worse it would be. Over a decadel time-scale (ten years or so) and to an limited extent, that is true.

But Methane is a volatile gas and quickly breaks down in the atmosphere. It decays away exponentially. Within 18 months of a release half is gone. Within 12 years the amount left is immeasurable.

So if your ruminant herd size is stable then the warming effect from the methane release from this herd is stable. If you increase the herd size then it is true the methane release increases. But the warming effect from this increase stabilises within ten years. The net result is that for all countries with more or less stable ruminant herd sizes the contribution to global warming is already factored in. Further warming from these stable herds will be nil. Zilch. Nada.

If you want some proof of this then try this post on the British Veterinary Associations website HERE. But better still refer to the actual paper from Oxford University (IPCC researchers none the less) HERE.

Remember though. We haven’t got to the inconvenient history of the American Bison yet.

American Bisons come from countries (the USA and Canada) that the average Vegan zealot would regard as the arch-criminals of meat eating Methane production.

The USA has between 60 and 80 million cattle, all farting and burping (mostly burping) out their Methane like there was no tomorrow. But, as shown by Oxford University, if the herd size is stable, all that warming from Methane is already factored in.

This is not a gaseous Armageddon in the making. But it gets even more interesting. In fact on an historical timescale there is a reasonable chance that total ruminant emissions, (including the millions of domestic cows) may well be lower now than it was 400 years ago.

How come?  It comes down to a (real) man-made ecological disaster that befel the American Bison in the 19th century.

American Bisons or Buffaloes (call them what you will) were nearly hunted to extinction from around 1830 through to 1880.

By 1880 there were less than 1000 American Buffalos left. Luckily, even in those dark days there were people who recognised the importance in preserving these magnificent beasts.

The American Plains Buffalo was rescued from the brink of extinction. The Woods Buffalo though was feared to be extinct for over 70 years.

Then by sheer luck a herd of 200 were found in a remote part Northern Alberta in Canada in 1957.

Today in total there are about 500,000 American Buffalos in existence. Their recovery from the brink of extinction is an epic tale and something we should all be proud of. Just as we should be truly appalled how they got to the point of extinction in the first place.

So what? You may ask. How does this relate to methane release?

One simple figure should tip you off.

Remember those 500,000 American Buffalos that exist today?

Well, that number is probably less than one per cent of the estimated herd size back in 1700.

Back in 1700 the American Buffalo herd size has been estimated at being between a low of 30 million and up to 75 million. There is even a possibility it topped 100 million. A total herd population of 60 million seems to be the consensus estimate. The herds of Buffalo once stretched from down in Miami right up to Alaska.

The net result of the hunting carnage in the 19th century is that today the methane emissions from the domestic American cattle herd is largely offset and maybe completely offset by that from the slaughtered (and now missing) 60 million American Bison.

So cattle ranching in the USA and Canada has in reality only brought ruminant methane release back up to around that in pre-settlement days.

Nobody suggests that the wanton slaughter of 60 million American Bison in the 19th century was a “good thing”. Far from it.

But it does mean that today the scare stories surrounding methane release from domestic cattle in the USA and Canada are at best over-blown.

At worst they are a myth.
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Notes:

There is quite a good Wikipedia piece on the American Bison HERE

More information on methane release by Bison and other wild ruminants can be found in This Article

What looks like an interesting book (only skimmed it so far) from the 1890’s titled:

The Extermination of the American Bison 
by William T. Hornaday

Hornaday was the Superintendent of the U.S. National Zoological Park. It looks like he was one of the heroes who saved the day as far as the American Bison was concerned.

His book is available for free from the Gutenberg project on THIS LINK.



Cows, Climate and Reality


Here’s the scary bit.

Ruminants (cows and sheep) fart and burp out Methane. Methane is a greenhouse gas many times more potent than Carbon Dioxide. Eighty six times more potent over a twenty year period. Thirty four times more potent over a hundred year period.

All of the above is true. Really!

But here's the rub.

Methane vented into the atmosphere is gone within nine years (somewhere between 8.75 and 9.5 actually – See Here ). It reacts (mainly) with hydroxyl radicals in the atmosphere to produce Water Vapour, Carbon Dioxide and Ozone.

So initially the greenhouse effect of Methane is stupendously high. But this is for a very, very short time. As the first few days turn into months the quantity of methane in the atmosphere from a release falls off a cliff. It literally disappears.

The greenhouse warming from a Methane release between years 9 - 100 in a 100 year period following a release is effectively nil. It is nil because there is none left 9 years after a release.

Methane decays in the atmosphere exponentially. Half of any release is gone in 14 months.

The net effect of a release of methane into the atmosphere is pretty much immediate and short lived.

The overall amount of Methane in the atmosphere linearly tracks the amount being released. Double the amount released – double the net amount in the atmosphere. Half the amount released then you halve it.

Assume you had a new continuous source releasing methane into the atmosphere. Then the amount of methane in the atmosphere would initially rise. Then it would level off as the newly released methane reached equilibrium with that decaying away.

After about two half-lives (say 2.5 years) the amount of methane in the atmosphere from your continuous and constant release will level off and stay constant.

Let's say our source of methane is ruminants like cattle and sheep.

It is true that cattle and sheep produce a lot of methane. 

But more to the point, they always have

They in effect provide a continuous and constant release of Methane into the atmosphere.

Unless the population size of these ruminants is changing then the amount of methane in the atmosphere from them will stay the same. It will be stable.

As methane has almost an immediate effect on global warming then that effect will already be evident and fully factored in today. There is no “build up” or appreciable time lag. 

If there is no further increase in total herd size then no further warming can be attributed to cattle or sheep.

Not convinced?

Here - try this latest piece of research from the British Veterinary Association. In fact their research shows that Methane release from UK sheep and cattle is actually falling. 

If it is falling then so is the established warming effect already in place from these ruminants.

The result is UK beef and sheep farms are already global warming negative. Their current activities are cooling the climate. 

If you don't believe me just read the British Veterinary Association article.

The world really is becoming a much better place. But to keep this progress on track and tackle the real issues regarding climate and pollution we need to bury the fear-mongering. 

Fakery like the current fiction that UK beef production is a terrible global warmer really does a disservice to us all.

(Don’t believe me the world is getting better? Read Factfulness by Hans Rosling – It’ll make your day) 

So whenever you see some spoilt child from Extinction Rebellion blubbering about how meat eaters have stolen their future, just tell them to lighten up and stop snivelling.

Then offer to buy them a burger.

You never know. It might work!