Épisodes

  • The Net Zero Accelerator's Colin Mangham on Nature's Rules for Building A Sustainable Infrastructure

    The Net Zero Accelerator's Colin Mangham on Nature's Rules for Building A Sustainable Infrastructure
    Feb 23 2026
    We already have the technology to decarbonize buildings, and many pilot projects have shown it works. So why hasn’t progress toward net zero moved faster? Colin Mangham believes it’s because we’re still using outdated business models to promote new solutions. Colin is the Chief Experience Officer at the US Green Building Council California and leads its Net Zero Accelerator, the first program focused only on net-zero innovation for buildings. Since 2019, the accelerator has helped over 100 companies in a six-month program that stands out by putting real technology pilots into actual buildings with dedicated partners, then tracking the results. This approach has led to more than 60 pilot projects in California and beyond, providing the proven results that founders and investors need to move forward. Colin offers a unique mix of experience to this field. He has served as Chief Marketing Officer at four growing companies, co-founded and led Morpho Energy, which helps put unused commercial rooftops to work for solar, and he is a certified biomimicry specialist, which shapes what he teaches founders. He often thinks about beavers, which are keystone species that create habitats for others by building their own homes. As he tells entrepreneurs, “This thing that you’re creating, it should also create better living environments for the people and the neighboring organisms all around you.” It’s an approach that applies systems thinking to business strategy, leading to companies that differ from the typical Silicon Valley disruptors.

    To learn more about the Net Zero Accelerator, visit NetZeroAccelerator.org. Learn about the US Green Building Council of California at USGBC-CA.org.
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    51 min
  • CurbWaste's Mike Marmo Is Building the Waste Logistics Layer of the Circular Economy

    CurbWaste's Mike Marmo Is Building the Waste Logistics Layer of the Circular Economy
    Feb 16 2026
    The U.S. waste management industry moves more than 290 million tons of municipal solid waste each year. This is a potential trillion-dollar market, but much of the work still relies on paper tickets, clipboards, and spreadsheets. About 10,000 independent haulers handle a large share of collection and materials transfer in the U.S. In this business, a single truck costs $300,000, and profits depend on efficient routes. Most haulers do not have access to the digital tools that other logistics industries have used for years. Mike Marmo, CEO and founder of CurbWaste, is building a new operating system to change this. His goal is to create the data foundation needed for the circular economy to work. He is a fourth-generation waste industry professional who started his career as a scale operator at a family transfer station in New York and sold a hauling business in 2021. Since then, he's built CurbWaste into a platform serving more than 150 haulers in 40 states. Its CurbPOS system for transfer stations tracks inbound and outbound materials with scale integration. It generates automated LEED diversion reports and Recycling Certification Institute-certified documentation; the per-load, per-material chain-of-custody data that extended producer responsibility programs need, as seven states now require producers to fund and document the recycling of their packaging.

    Mike made a simple but important point: "Waste is being created when it's being manufactured." The waste management industry reflects the economy and could become the base for a circular supply chain that keeps materials in use. Mike compares this to Amazon, which learned about buyer behavior and then built warehousing, freight, and delivery systems around that knowledge. The waste industry can do something similar. By tracking what is produced, where it goes, and where it ends up, haulers and new operators can work together on a shared digital system that gives full visibility of materials. Mike calls this the "waste meter," and he thinks an AI-powered circular economy could be in place within 10 years. Accenture research estimates that the circular economy could add $4.5 trillion in economic output by 2030, a number supported by the United Nations Development Program. Right now, investment is far below what is needed to reach that potential. CurbWaste is working to build the transparency needed to connect collection and vision, helping turn a fragmented industry into a circular supply chain. To learn more, visit curbwaste.com.
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    42 min
  • The Ocean Conservancy's Dr. Erin Murphy Documents the Lethality of Ocean Plastics

    The Ocean Conservancy's Dr. Erin Murphy Documents the Lethality of Ocean Plastics
    Feb 9 2026
    Each year, over 11 million metric tons of plastic end up in the ocean, which is like dumping a garbage truck full of plastic every minute. For years, we’ve known that marine animals eat this debris, but no one had measured exactly how much plastic it takes to kill them. Dr. Erin Murphy, who leads ocean plastics research at the Ocean Conservancy, is the principal author of a major study published in the Proceedings of the National Academy of Sciences. Her team analyzed more than 10,000 necropsies from 95 species of seabirds, sea turtles, and marine mammals worldwide. Earth911’s summary describes this critical study, which found lethal plastic thresholds that could change how we view the plastic crisis.

    The study measured how deadly different types of plastic are to sea life, which makes the results especially useful for policymakers. Each finding suggests a clear policy action, such as banning balloon releases like Florida has done, banning plastic bags as in California’s SB 54, or improving how fishing gear is marked and recovered. Still, Erin points out that focusing only on certain plastics is not enough. Her team found that even small amounts of any plastic can be dangerous. As she says, "At the end of the day, there is too much plastic in the ocean," and we need big changes at every stage of the plastics life cycle, from production to disposal.

    There's encouraging evidence that interventions work. Communities in Hawaii conducted large-scale beach cleanups and saw the Hawaiian monk seal population rebound. A study published in Science confirmed that bag bans reduce plastic on beaches by 25 to 47%. And Ocean Conservancy's International Coastal Cleanup, now in its 40th year, removed more than a million plastic bags from beaches last year. These actions address a parallel crisis in human health that is building from the same pollution source. Most of the microplastics now found in humans and around the world began as the same macroplastics that are killing puffins and turtles. As Erin puts it, "I do view this all as part of the same crisis."

    You can read the full study at pnas.org and learn more about Ocean Conservancy's work at oceanconservancy.org.
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    44 min
  • Milwaukee's Kevin Shafer on Circular Thinking in Wastewater Management

    Milwaukee's Kevin Shafer on Circular Thinking in Wastewater Management
    Feb 2 2026
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    Every gallon of wastewater flowing through a municipal sewer contains recoverable energy, nutrients, and water—assets that the linear "flush and forget" model has long treated as problems to dispose of rather than value to recapture. Meet Kevin Shafer, who has spent more than two decades proving otherwise. As executive director of the Milwaukee Metropolitan Sewerage District (MMSD) since 2002, he's transformed an agency once mocked as a symbol of government waste into a national model for sustainable infrastructure, and last year, Veolia designated it as America's first "eco factory."

    Milwaukee's circular approach actually predates the term by nearly a century. In 1926, the district began producing Milorganite—Milwaukee organic nitrogen—a fertilizer made from dried biosolids that most utilities simply spread on fields or incinerate. Today, that product returns $11 to $12 million annually to the city's budget while keeping waste out of landfills. Kevin explains that this foundational commitment to doing the right thing has shaped MMSD's culture ever since: 'We just always look at those type of approaches. It's foundational to the district.'

    The district's eight digesters at its South Shore plant now generate 80 to 85% of the facility's electricity from biosolids, with enough material left over to continue making Milorganite. Kevin calls it Cradle to Cradle in action, referring to the philosophy pioneered by architect William McDonough, who visited MMSD in 2006 and was intrigued by work that predated his framework by decades. The district is also partnering with regional breweries and food processors, accepting their organic waste streams for co-digestion. This reduces disposal costs for industry partners while increasing energy production—a synergy that Kevin sees as the future of utility operations.

    Looking ahead, Kevin's 2035 vision targets 100% renewable energy and a 90% carbon reduction compared to 2005. He argues that utilities should see themselves as anchor institutions with generational responsibilities: 'I won't be here 50 years from now, but MMSD will be.' That long view has attracted new partners. 'All of a sudden they say, oh, here's someone that's thinking a little bit differently about something, and maybe we can help them, or they can help us.' The key barrier to scaling the circular economy, he believes, isn't technology—it's institutional culture and a narrow focus on regulatory compliance rather than systems thinking.

    You can learn more about the Milwaukee Metropolitan Sewerage District at mmsd.com.
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    43 min
  • Peter Fusaro's Wall Street Green Summit Explores Financing The Renewables Transition

    Peter Fusaro's Wall Street Green Summit Explores Financing The Renewables Transition
    Jan 19 2026
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    Global investment in the energy transition reached $2.2 trillion in 2025, up 5% from the previous year despite political headwinds intensified. Peter Fusaro has watched this market evolve from a niche curiosity into a systemic financial concern. As founder of the Wall Street Green Summit, he's spent a quarter century connecting capital to climate solutions. This year's summit, the 25th in its history, will take place on March 10 and 11 in New York. This critical conversation arrives at an historic inflection point: insurance companies are withdrawing from climate-vulnerable states, AI data centers are straining electrical grids, and the economics of clean energy have fundamentally shifted.

    The energy transition's bottleneck isn't capital, it's infrastructure. The U.S. went from 110 investor-owned utilities in 1992 to just 40 today, and consolidation meant underinvestment in transmission and distribution. Data centers consumed 2% of U.S. energy demand in 2020; Peter sees that climbing to 10-12% by 2030. Blackouts and brownouts are inevitable, he says. Yet his message is pragmatic optimism: ignore Washington and watch the capital markets and blue states where climate policy is embedded in law. Many companies are "green hushing," quietly pursuing sustainability without public positioning. The energy industry thinks in 40-year cycles, making the current political moment a blip. "I've spent 56 years now in sustainability, before it had a name," he says. "What I've learned is change takes decades."

    Peter argues that Wall Street has genuinely internalized climate as systemic risk—not because of ideology, but because of opportunity. "Wall Street likes exchanges, likes to trade, likes volatility, and certainly likes uncertainty," he explains. "What people don't understand about Wall Street, it's about the edge. What's the arbitrage opportunity?" The reinsurance industry has stepped forward aggressively, funding carbon credits and sustainability projects. Peter's recent Earth911 article, "Climate Risk Has Become a Defining Economic Issue," explores these themes in depth.

    However, he sees natural gas and renewables dominating the next 15 years, while geothermal is enjoying a genuine renaissance. His optimism rests on a demographic bet: "I have a tremendous valuation on young people. I'm 75. They're inheriting this world, and they get the sustainability message globally." The summit attendees includes no government officials and no academics, just people in the trenches building and financing solutions.

    You can learn more at TheWallStreetGreenSummit.com. Earth911 is a media sponsor for the event.
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    48 min
  • Turning Waste Into New Products And Packaging With Overlay Capital's Elizabeth Blankenship-Singh

    Turning Waste Into New Products And Packaging With Overlay Capital's Elizabeth Blankenship-Singh
    Jan 12 2026
    Read a transcript of this episode. Subscribe to receive transcripts.

    What we call waste is really just misallocated feedstock—raw materials waiting to be cycled back into the next generation of products and packaging. According to research by the World Economic Forum and United Nations Development Programme, the circular economy could unlock $4.5 trillion in new global value by 2030, and investors are racing to capture part of that opportunity. Meet Elizabeth Blankenship-Singh, Director of Innovation at Overlay Capital, an Atlanta-based alternative investment firm whose Waste and Materials Fund is backing both early-stage materials innovators and later-stage recycling operations with established infrastructure. Overlay's strategy involves investing in innovation and implementation simultaneously—in both startups and established companies—to accelerate progress across multiple layers of the circular economy. It offers a window into where smart money sees the materials transition heading.

    Elizabeth explains that sortation is the biggest bottleneck at the materials recycling facilities (MRFs) your garbage and recycling are sent to after curbside collection. The U.S. is simultaneously the world’s leading exporter of scrap aluminum and the number one importer of finished aluminum, because we've lacked domestic sorting capacity. Overlay has invested in companies like AMP Robotics, which recently closed a 20-year contract with SPSA, a southeastern Virginia municipal authority, to sort all recyclables from four to five cities using AI-driven systems. When you fix sortation, she says, you trigger a domino effect: recycling rates climb, landfill life extends, and margins improve as higher-purity materials command premium prices.

    Overlay's portfolio also includes next-generation materials companies united by a common thesis: they must be better, faster, cheaper, and more sustainable than what they replace. Cruz Foam converts chitin from shrimp shells into compostable packaging foam. Simplifyber uses cellulose to create biodegradable soft goods through 3D molding, bypassing traditional textile manufacturing entirely. Terra CO2 just closed a $124 million Series B to scale low-carbon cement technology that could cut into concrete's 8% share of annual global CO2 emissions. Each uses abundant, waste-derived feedstocks and has achieved or is on a clear path to price parity with incumbents.

    You can learn more about Overlay Capital at overlaycapital.com
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    44 min
  • Dandelion Energy CEO Dan Yates On How Geothermal Leasing Could Transform Home Heating and Cooling

    Dandelion Energy CEO Dan Yates On How Geothermal Leasing Could Transform Home Heating and Cooling
    Dec 29 2025
    Read a transcript of this interview.

    Amazingly, the same Congressional bill that gutted residential clean energy tax credits also led to a major breakthrough in financing home geothermal systems. Dan Yates, CEO of Dandelion Energy, explains how the Big, Beautiful Bill introduced changes that, for the first time, allow third-party leasing of residential geothermal systems. He shares why this policy change could help ground-source heat pumps grow the way leasing helped rooftop solar. Geothermal heating and cooling is four times more efficient than a furnace and twice as efficient as air-source heat pumps. Yet only about 1% of U.S. homes use it because the upfront costs for new geothermal systems have ranged from $20,000 to $31,000. The new leasing model means new homeowners can get geothermal systems for just $10 to $40 per month on a 20-year lease, which is usually far less than what they save on energy.

    Dandelion is working with Lennar, one of the largest homebuilders in the country, to bring geothermal to more than 1,500 homes in Colorado over the next two years. This will be one of the biggest residential geothermal projects in U.S. history. The benefits for the power grid could be even more important than the savings for homeowners. Geothermal systems use only 25% of the peak power that air-source heat pumps need, which is a big advantage as AI data centers increase electricity demand. Yates explains that the Earth works like a huge thermal battery, storing heat in the summer for use in the winter. Geothermal lets utilities reduce peak loads on the grid throughout the year, freeing homeowners from the cost of the most expensive power.

    You can learn more about Dandelion Energy at dandelionenergy.com.
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    38 min
  • Okhtapus Cofounder Stewart Sarkozy-Banoczy Accelerates Ocean Solutions

    Okhtapus Cofounder Stewart Sarkozy-Banoczy Accelerates Ocean Solutions
    Dec 22 2025
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    The ocean provides half the oxygen we breathe, absorbs 30% of our carbon emissions, and helps control the planet's climate. By 2030, it's expected to support a $3.2 trillion Blue Economy. Yet 70% of proven ocean solutions, such as coastal resilience, coral restoration, and marine pollution cleanup, never move past the pilot stage. These projects often win awards and get media attention, but then stall because funding systems don't connect working ideas with the cities, ports, and coastal areas that need them. Stewart Sarkozy-Banoczy, co-founder and ocean lead at Okhtapus, wants to change that. Okhtapus, named with the Persian word for the octopus, uses a model that links what Stewart calls "the three hearts" of successful projects: innovators with proven solutions, cities and ports ready to use them, and funders looking for solid projects.

    The first Okhtapus Global Replicator will launch in 2026. It will bring groups of proven innovators to work on important projects in specific places, such as a single port city like Barcelona, where Okhtapus already has strong partnerships, or a group of Caribbean islands facing similar problems. The aim is to have enough successful projects that funders stop asking "where are the deals?" and start saying "we've got enough." The platform focuses on late-stage startups and scale-ups, not early-stage ideas. Stewart calls these the "Goldilocks zone"—solutions that are proven enough to copy but still need funding and partners to grow. By combining several solutions for different locations, Okhtapus can offer investors portfolios that fit their needs and make a real difference in cities, ports, and island nations.

    Stewart has spent twenty years working where climate resilience and policy meet. He was part of President Obama's Hurricane Sandy Rebuilding Task Force, led policy and investments at the Resilient Cities Network, and is now Managing Director of the World Ocean Council. "Ten years from now, if this is done fast enough," Stewart said, "we should have pushed hard enough on the funders and the system to change it. What we don't know is whether we'll get to the solution status fast enough for some of these tipping points."

    To find out more about Okhtapus, visit okhtapus.org.






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    59 min