Assertion Supported AI assessment confidence: 88% certainty 4/5 debate potential 2/5

Stemple Creek Ranch Sequesters About 1,000 Pounds of Carbon Per Acre Annually

Loren Poncia · How I Built Resilience: Loren and Lisa Poncia of Stemple Creek Ranch · Jan 28, 2021 · at 2:14

Loren Poncia, co-founder of regenerative meat producer Stemple Creek Ranch, discusses soil measurement data from his multi-year study with the Marin Carbon Project.

0:00 / 0:10exact quote · 10.7s

720p mp4 · rendered on demand · StarZero watermark

“Basically what the data seven years later shows is we're sequestering about a thousand pounds of carbon per acre per year, managing it the way we are, even our control plots.”

quote is from the automated transcript, cleaned for reading: filler sounds and stutters are removed, nothing is rephrased. names can be misheard (the analysis reads context, assessments check outside sources). how →

The claim, plainly

Seven-year data from the Marin Carbon Project shows that Stemple Creek Ranch sequesters about 1,000 pounds of carbon per acre per year through its regenerative ranching practices.

a quote alone can be ambiguous, so this restates it with the references and context of the conversation around it resolved. AI-written; the tape below the player is the source.

Assessment

In 2013, the Marin Carbon Project selected Stemple Creek Ranch as one of its three initial demonstration ranches to measure and implement carbon farm planning. Research led by Dr. Whendee Silver's lab at UC Berkeley measured an average soil carbon sequestration rate of 1 metric ton of carbon per hectare per year (1 Mg C/ha/yr) on compost-amended grazed rangelands, which converts directly to approximately 892 pounds of carbon per acre per year (frequently reported in project literature as 900 to 1,000 pounds per acre per year). Seven-year follow-up data, Carbon Farm Plan assessments, and multi-year technical summaries for Stemple Creek Ranch document annual carbon sequestration between 1,000 and 3,000 pounds per acre under its regenerative management practices, confirming the accuracy of Poncia's stated figure.

UC Berkeley Silver Lab research (Ryals & Silver 2013; Ryals et al. 2014, 2015) established an empirical rangeland carbon sequestration rate of 1 Mg C/ha/yr (~892.2 lbs C/acre/yr).
Marin Carbon Project demonstration trials begun at Stemple Creek Ranch in 2013-2014 established a multi-year monitoring dataset across the ranch's Carbon Farm Plan implementation.
Technical summaries from the Marin Carbon Project, Carbon Cycle Institute, and regional land trusts report Stemple Creek Ranch sequestering 1,000 to 3,000 lbs of carbon per acre per year under its regenerative practices.

Checked against

[1] ucanr.edu [2] researchgate.net [3] carboncycle.org [4] marincarbonproject.org [5] marincarbonproject.org [6] stonehouse.io [7] soilhealthacademy.org [8] cleaneatingmag.com

"Ryals" "Silver" "1 ton" OR "1 Mg" "ha" "carbon" rangeland "Stemple Creek Ranch" "Marin Carbon Project" "Silver Lab" OR "Silver" OR "carbon" "Marin Carbon Project" compost application "Stemple Creek" "Silver Lab" "Stemple Creek Ranch" "Carbon Farm Plan" "1,000" OR "one ton" OR "metric ton" "Marin Carbon Project" "Stemple Creek" carbon sequestration per acre per year

assessed as of 2026-09-03

This assessment is an AI reading of a public statement, made against the cited references with the confidence shown. It can be wrong. The quote, the tape and the references are all on this page; if something is off, use report an error below. full disclaimer →

Mentioned

carbon sequestration Marin Carbon Project Stemple Creek Ranch

⚑ Spot an error? Report it

More from Loren Poncia

Insight

Loren Poncia: Air in Soil, Not Water, Limits Dryland Pastures

“And many people would say, oh, it's water because we're dry half the year, but that's not really truly our limiting factor. Our biggest limiting factor is air in the soil because without air in the soil, it's like a human with a 300 pound weight on our chest.”

Loren Poncia Jan 28, 2021 ▶ 3:43 How I Built Resilience: Loren and Lisa Poncia of Stemple Creek Ranch

Opinion

Poncia: Converting Midwestern row crops to pasture could feed US meat demand

“If we converted that land back to pasture land, perennial pasture land, we could grow probably enough meat for the entire nation. It is possible.”

Loren Poncia Jan 28, 2021 ▶ 9:43 How I Built Resilience: Loren and Lisa Poncia of Stemple Creek Ranch

Insight

Loren Poncia: Grass-fed meat is cheap relative to nutrient density

“When you look at the nutrient density of grass-fed meat compared to all the other things on the grocery store, it's actually relatively cheap when you look at the nutrient density.”

Loren Poncia Jan 28, 2021 ▶ 12:11 How I Built Resilience: Loren and Lisa Poncia of Stemple Creek Ranch

Opinion

Loren Poncia: True Nutrient Density Requires Prioritizing Cows Over Chemists

“I think when it comes to true nutrient density, I much prefer cows over chemists.”

Loren Poncia Jan 28, 2021 ▶ 20:31 How I Built Resilience: Loren and Lisa Poncia of Stemple Creek Ranch

Opinion

Loren Poncia: Sugar causes more dietary issues than meat consumption

“I'd rather have no sugar Sunday than no meat Monday, because I think sugar is causing way more dietary issues and health issues for both the planet and for consumers.”

Loren Poncia Jan 28, 2021 ▶ 20:44 How I Built Resilience: Loren and Lisa Poncia of Stemple Creek Ranch

Assertion Supported

Poncia: Most cattle are raised on non-farmable land

“Most of these cattle are raised on non-farmable land. It's not like we're putting cattle on the flat land that you can drive a tractor to grow these other things.”

Loren Poncia Jan 28, 2021 ▶ 21:07 How I Built Resilience: Loren and Lisa Poncia of Stemple Creek Ranch

Stemple Creek Ranch Sequesters About 1,000 Pounds of Carbon Per Acre Annually

More from Loren Poncia

Turn any episode into a week of clips.