Episode Summary
Executive Summary: Harry Tannenbaum explains how Mill is tackling food waste by turning uneaten household food into dehydrated “food grounds,” then collecting them via USPS to create animal feed ingredients. The conversation frames food waste as a major climate, economic, and systems problem, and Mill as a delightful consumer product plus distributed infrastructure designed to change behavior and reduce landfill methane.
Main Topics: The scale and climate impact of food waste (Priority: 5/5): The discussion opens with why food waste matters: huge volumes of edible food are discarded, households are the largest source, and landfilled food produces methane emissions that significantly contribute to climate change. Harry Tannenbaum’s path from Nest to Mill (Priority: 4/5): Harry describes his education, early career at Nest, lessons learned working with Matt Rogers, and the personal and professional motivations that led him to focus on waste during the pandemic. How Mill’s product works (Priority: 5/5): Mill’s kitchen bin dries and shrinks uneaten food overnight, eliminating odor and volume, making it easier for households to separate food from trash and enabling a new collection flow. Reverse logistics and circular end use (Priority: 5/5): Mill uses USPS pickup to return food grounds for sorting, testing, and eventual conversion into animal feed ingredients, with chickens/eggs as the initial target market. Consumer behavior, measurement, and systems change (Priority: 4/5): Mill is positioned as a systems-change company that succeeds by making the right action frictionless and delightful, while also giving users data to measure and improve their food waste habits. Business model, subscriptions, and incentives (Priority: 4/5): The membership model includes hardware, odor filters, pickup, warranty, and support. Owning the bin creates incentives for durability and repairability rather than planned obsolescence. Stealth, partnerships, and scaling challenges (Priority: 3/5): Harry discusses the pros and cons of building in stealth, the pressure of launching with a mature cap table, and the importance of municipal partnerships like Tacoma to prove the model at scale.
Key Arguments: Food waste is a major climate problem because agriculture is ~25% of emissions and food waste/loss is ~8-10% of emissions, with landfill methane representing a meaningful share. Households are the largest source of food waste, making the problem both personal and solvable through consumer behavior change. Mill’s approach works because it removes water from food, shrinking volume and preventing putrescibility, which reduces stink and makes collection/logistics viable. A circular loop is more valuable than linear waste disposal: food should ideally be eaten by people, then animals, then returned to productive use. A consumer climate product must be genuinely better in daily life, not merely morally desirable; Mill is designed to win on convenience, cleanliness, savings, and delight. Measuring food waste changes behavior; the app can create awareness much like Nest’s energy reports did for electricity use. Owning and operating the bin aligns business incentives with durability, repairability, and long-term infrastructure rather than encouraging more wasteful hardware sales. Public-private partnerships and city-by-city policy structures are essential because materials management is locally governed and operationally fragmented.
Data Points: Agriculture emissions share: about 25% - Harry cites agriculture’s contribution to total emissions as part of the case for tackling food waste. Food grown but not eaten: about 40% - He describes the magnitude of wasted food across the food system. Food share of landfill: 24% - From EPA landfill composition data, food is described as the single largest inhabitant of landfills. Household share of food waste: about 43% - Residential households are cited as the largest source of food waste in the U.S. Food waste emissions share: 8% to 10% - Harry frames food waste and loss as a major emissions source, comparable to a large country. Landfill methane emissions share: about 2% - He notes methane from landfilled food waste as a significant portion of emissions. Food waste per household per year: 500 to 600 pounds - He quantifies the annual amount thrown away by a typical U.S. household. Household annual cost of food waste: about $2,000 - Harry links wasted food to direct economic loss for consumers. Access to curbside food-scrap collection: about 5% of Americans - He says only a small share of U.S. households have access to curbside organics pickup. Food composted in the U.S.: around 6% - EPA composting rate referenced for uneaten food. Food sent to landfill: 60% to 70% - Harry estimates most uneaten food ends up in landfills. Food incinerated: 10% to 15% - He gives an approximate share for incineration as an end-of-life pathway. Food moisture content: about 80% water - Used to explain why dehydration dramatically reduces waste volume and transport burden. Resulting moisture content: 12% to 13% - At this level, microbes that drive decomposition can no longer operate effectively. Household volume reduction: about 600 pounds to 100 pounds per year - Mill turns a household’s annual uneaten food into a much smaller amount of food grounds. Protein content of food grounds: around 19% - Harry notes the nutritional value of the processed material. Food grounds fill rate: about a month for a household of two - Used to illustrate the bin’s capacity and convenience. USPS coverage: 99% of American households - The collection model leverages postal delivery routes for return logistics. Animal agriculture land use: one-third of arable land - He uses this to justify targeting animal feed as the first end use. Animal feed grain use: one-third of global grain - Supports the argument that rerouting food to feed can reduce pressure on primary agriculture. Global chicken population: 27 billion - Used to highlight the scale of demand for feed ingredients. Food waste sent to landfill globally: 50 million tons per year - Harry uses this number to emphasize the scale of the opportunity. Nest energy savings: 100 billion kilowatt hours - He cites the legacy climate impact of Nest as a point of comparison and proof of behavior-driven systems change. Tacoma cart size savings: $26 to $27 per month - Potential savings from reducing curbside waste cart size in Tacoma, relevant to Mill’s value proposition. Membership pricing: about $1 per day - Harry describes the subscription cost as an all-in model including hardware and service.
Pivotal Quotes: "One way to visualize it is we go to the grocery store and we buy five bags of food and we just leave two of them in the parking lot." — Harry Tannenbaum: Explaining the scale and absurdity of household food waste "This is a systems change company... wrapped in a layer, in a delicious seaweed layer of individual action." — Harry Tannenbaum: Describing Mill’s theory of change and how consumer behavior can drive infrastructure change "We are not counting on altruism here." — Harry Tannenbaum: Clarifying that Mill must win on product experience and economics, not just environmental intent
Implications: Mill shows how climate products can scale by improving daily life, not asking for sacrifice. If it works, household food waste could shift from landfill methane to a circular feed system, reshaping consumer habits and local materials infrastructure.