Episode Summary
Executive Summary: The episode explores how Evan Thomas built Varidi to use sensors, satellite data, and carbon-finance/business-model innovation to solve water access problems in East Africa and the American West. The conversation covers his NASA-to-entrepreneur path, how carbon credits fund clean drinking water, why drought and groundwater scarcity are converging globally, and how the same hardware can support distinct markets: carbon credits in Africa and demand response plus water-saving in California.
Main Topics: Evan Thomas’s career path from NASA to climate entrepreneurship (Priority: 5/5): Thomas explains how work on spacecraft life-support systems at NASA—especially water recycling—led him to apply similar thinking to Earth’s water challenges, eventually launching a social enterprise and later Varidi. Carbon credits as a financing mechanism for clean drinking water (Priority: 5/5): The discussion details how Varidi adapted cookstove-style carbon credit methodologies to avoid emissions from boiling water with wood or kerosene, while also addressing the health crisis caused by untreated drinking water. Water and climate similarities between East Africa and the American West (Priority: 5/5): Thomas argues drought-driven aridification is making regions like Kenya, Ethiopia, Colorado, and California more similar than different, though the governance and infrastructure constraints differ significantly. Varidi’s technology stack: sensors, satellite data, and analytics (Priority: 5/5): Varidi’s product combines a universal pump monitor, cloud analytics, and machine learning to detect pump failures, water quality issues, and usage patterns, with data gathered from the ground and enhanced by remote sensing. Two distinct business models for two geographies (Priority: 5/5): In East Africa, Varidi monetizes carbon credits tied to safe water delivery; in the U.S. West, it uses demand response programs to reduce groundwater pumping during peak electricity demand. Water governance, subsidies, and the economics of scarcity (Priority: 4/5): The conversation highlights how water is underpriced, highly subsidized in some places, and often treated as a private good despite being a human right, making policy and financing as important as technology. Soil carbon as a new environmental commodity opportunity (Priority: 4/5): Thomas describes extending Varidi’s sensing and modeling approach to soil carbon measurement, enabling regenerative agriculture practices to be quantified and monetized through carbon markets.
Key Arguments: NASA experience is directly relevant to climate solutions because spacecraft life-support systems require high-reliability water management, recycling, and quality monitoring. Carbon markets can finance basic services in low-income regions when traditional aid is finite, helping sustain clean water systems after grants expire. Varidi’s approach works because it measures real-world outcomes and creates an audit trail, making carbon credits more credible than many nature-based offsets. East Africa and the American West are both becoming drier due to climate change, but Africa’s main constraint is infrastructure and finance, while the U.S. West’s is overuse, regulation, and groundwater depletion. Technology alone does not solve water insecurity; policy, economic incentives, and climate finance are necessary to translate data into action. Demand response can align utility needs with agricultural pumping behavior, creating a monetizable pathway to reduce both energy use and groundwater extraction. Environmental commodity markets are becoming more viable because climate crises and policy shifts—such as COP27 and the Inflation Reduction Act—are creating real demand and funding mechanisms. Soil carbon measurement requires on-the-ground sensing because remote sensing alone cannot accurately verify carbon accumulation needed for crediting. University research and company commercialization are complementary: academia is better for R&D and validation, while the company is better for scaling and market deployment.
Data Points: People lacking safe drinking water: 1 billion - Thomas cites the global number still lacking access to safe drinking water. Cost to launch water into space: $20,000 per liter - NASA’s extreme water cost motivates recycling on the space station. Water recycled on the space station: ~90% - Thomas explains NASA recycles most collected astronaut wastewater back into drinking water. Water collected per astronaut per day in space: ~3 liters/day - He describes sweat, respiration, and urine collected from each astronaut daily. Time since start of drinking-water carbon credit work: ~16 years - Thomas says the Rwanda carbon-finance water work began in 2007. Children dying from diarrheal disease: Millions annually - He links untreated water to preventable diarrheal illness and mortality. People facing food insecurity in East Africa: 40 million - Referenced in relation to an unprecedented five-season drought. Groundwater depth mentioned in East Africa: 100 meters deep - Deep aquifers are tapped to mitigate drought. Water systems monitored by Varidi: More than 4 million people - Varidi’s sensors monitor groundwater pumping and water access in East Africa. Sensor deployment scale: Thousands of devices - Thomas says Varidi has installed thousands of monitors around the world. Series financing raised: $5.5 million - Varidi’s recent equity round led by Accord Capital. Advance purchase/project finance raised: Close to $5 million - Pre-purchased carbon credits helped finance projects before delivery. California groundwater depletion: Ground has dropped 40 feet in 80 years - Thomas cites subsidence in parts of the Central Valley from unsustainable pumping. California compliance timeline: 2040 - Full compliance with the Sustainable Groundwater Management Act is expected by 2040. Subsidized water cost in Boulder: 75% subsidized - Illustrates how water prices often do not reflect true delivery costs. Average groundwater drought risk in California: Third decade of a mega drought - He describes the West’s long-term aridification and risk to major reservoirs and hydropower.
Pivotal Quotes: "NASA is a great incubator for people that want to help preserve the planet." — Evan Thomas: He explains why his NASA background translated into climate and water entrepreneurship. "Technology doesn't solve anything by itself. It's also about policy, it's about the economy, and fundamentally it's about poverty." — Evan Thomas: Thomas emphasizes that water access is a systems problem, not just an engineering problem. "Hardware is hard." — Evan Thomas: He summarizes why physical deployment, service, and maintenance matter more than pure software in climate markets.
Implications: Climate solutions increasingly depend on blended models: sensors, data, policy, and finance. Water insecurity is both a humanitarian and market challenge, and credible measurement plus incentive structures may unlock scale across regions and commodity types.