[Stoves] SPAM Soot may only be half the problem when it comes to cookstoves

Fri Apr 17 10:06:01 CDT 2020

Dear Bruno

I can’t say this is news. OC is a net cooling in the air and BC is a net warming.  Together they are net cooling.

“Rajan Chakrabarty, assistant professor of energy, environmental and chemical engineering, took his research to a pollution hotspot: Chhattisgarh, in the heart of rural central India, where cookstoves are one of the biggest emitters of aerosols and greenhouse gases."

The region burns more biomass as agricultural residue than fuel wood. Estimates from India indicate the crop waste burn-off that creates the “Asian Brown Cloud” each year range from 550 to 800 m tons. That is for that event alone.

Yes, it may be a major source of GHG’s but the total net effect is cooling. Check the IPCC report graphs. It shows the amount of cooling from burning biomass.

Improving a wood stove greatly, reduces the OC and BC emitted, providing net GHG warming.  Burning less fuel (because the improved stove is more fuel-efficient) doesn’t change the result.  Not burning the fuel at all provides less cooling, so net warming.  Burning it really cleanly provides net warming.  Claiming that burning wood creates GHG’s and therefore contributes to global warming is untrue – like so many other things said on the matter.  Sequestering biomass by not burning it has a net warming effect due to the loss of cooling.  Burning it very cleanly is definitely net warming.

Pick your poison.

Consider this: there are carbon trading projects where unsustainably harvested biomass fuel “not burned” is credited as sequestered carbon, but the same project will not consider the net warming produced when that fuel is left unburned. They are only looking at half the equation – and making money on the trade.  You really wonder what these people would do if they had to get a real job.

Regards
Crispin

From: Stoves <stoves-bounces at lists.bioenergylists.org> On Behalf Of Bruno M.
Sent: Thursday, April 16, 2020 11:58
To: Discussion of biomass cooking stoves <stoves at lists.bioenergylists.org>
Subject: [Stoves] ***SPAM*** Soot may only be half the problem when it comes to cookstoves

Soot may only be half the problem when it comes to cookstoves
Researchers find organic carbons are also absorbing light -- and likely harming people's health
Date: April 15, 2020
Source: Washington University in St. Louis

Summary:Researchers spent two weeks in India cooking with local residents.
They found that soot wasn't the only worrisome byproduct of traditional cookstoves;
 organic carbons are causing problems, too.

https://www.sciencedaily.com/releases/2020/04/200415110459.htm<https://eur05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.sciencedaily.com%2Freleases%2F2020%2F04%2F200415110459.htm&data=02%7C01%7C%7C3114d0893f0a4df0ada008d7e21f3e96%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637226496148615006&sdata=2U77EUL5geL2moKkaLpLmIxxkD85Zi6tb%2BKbTpF7oBc%3D&reserved=0>
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