Entries by Kim Still

Shipping and Climate Change

Balthazar Schulte, Lyttleton Harbor, New Zealand I recently read a Time article that pointed out that shipping accounts for 2.2% of annual global greenhouse gas emissions. To put it in perspective the writer, Aryn Baker, suggests that if shipping was a country, it would be the sixth largest CO2 emitter in the world, on par […]


Natural Gas, Methane and Nitrogen Oxides

I didn’t realize that natural gas is mostly methane which is about 84 times worse for climate change compared to CO2. As reported in the recently published study “Methane and NOx Emissions from Natural Gas Stoves, Cooktops, and Ovens in Residential Homes,” methane leaks are bad news for both environmental and personal health. (Lebel, et al, […]

Climate Change: Replacing Natural Gas and Coal Burning in the USA

Could biomass energy reduce the increased demand on electricity for home heating? Could the clean burning of biomass make a greater percentage of electricity partially replacing coal and natural gas, powerful climate forcers? Source: www.eia.gov/energyexplained/electricity/electricity-in-the-us As seen above, renewable energy now makes 20% of the electricity generated in the USA. Residential and commercial energy use makes […]

Tuning A Stove With Real Time Data

PM2.5, CO2, CO and other metrics measured by the LEMS are displayed in a real-time graph during testing. When enough data is available in real time, it is not hard to make progress improving a stove. The LEMS emission hood provides real time, holistic feedback as the experimenter makes changes. Watching all of the measures […]


Dr. Kirk Smith and The Breathing Space Project

Dr. Kirk Smith, a hero ARC worked closely with Dr. Kirk Smith (1947-2020) when we helped to include emissions in the Water Boiling Test, used to evaluate biomass cookstove performance, for the Shell Foundation. We included the first “Tiers of Performance” with a simple approach that divided stoves into two categories: improved and unimproved. It […]

Post Combustion Reduction of PM2.5

Electrostatic Precipitation: Smoke particles are negatively charged and attracted to positively charged metal plates that are automatically cleaned. Both automobiles and the biomass industry rely on improving combustion efficiency and post combustion reduction of PM2.5 to achieve “clean burning.” It’s really hard to rely on the combustion chamber to burn up enough of the harmful […]

Mass, Insulation and Thermal Efficiency

Kuniokoa Stove, original top replaced with cast iron top. It is more likely that close to 50% thermal efficiency will be achieved with a biomass burning stove when: Small sticks are burned that produce tall, hot flames while using the least amount of wood.A 30cm in diameter aluminum pot is used with a 14cm high […]


Justa, Dos por Tres, Patsari Stoves!

Dos por Tres Stove with Chimney, photo courtesy of Proyecto Mirador During an ETHOS panel discussion on Cooking, Health, and Climate, it was great to see that the Justa stove with chimney protected health so well. Chimneys are mandated by law in the USA/Europe/China and many other countries. When Mahatma Gandhi returned to India from […]


ETHOS is Great!

Yesterday morning I was on an ETHOS panel discussing stoves, health and climate change. I loved the discussion and was filled with hope that facing the end of the fossil fuel era might catalyze better use of resources.  Living sustainably has been a dream of mine since I was 15 years old in 1967. Like […]