Episode Summary
Executive Summary: Live from SF Climate Week, Senator Scott Wiener and Heirloom CEO Shashank Samala discuss how climate policy and climate tech reinforce each other. The conversation centers on California’s SB 253 carbon disclosure law, the market need for high-quality carbon removal, and how public policy, MRV standards, and startup coalitions can accelerate decarbonization and removals at scale.
Main Topics: California’s SB 253 and corporate emissions disclosure (Priority: 5/5): Senator Wiener explains how SB 253 requires large companies doing business in California to disclose scope 1, 2, and 3 emissions, why it survived intense lobbying, and how it creates transparency and accountability across corporate supply chains. Carbon removal market and Heirloom’s approach (Priority: 5/5): Shashank Samala describes Heirloom’s limestone-based direct air capture technology, its Tracy, California facility, the Microsoft deal, and the company’s role in building a carbon-negative economy. Scope 1, 2, and 3 emissions as the basis for action (Priority: 4/5): The speakers define emissions scopes and emphasize that scope 3 often dominates corporate footprints, making disclosure essential for identifying where reductions and removals are needed. Measurement, reporting, and verification (MRV) and assurance (Priority: 4/5): The discussion highlights the need for auditable carbon accounting and removal verification, with standards around permanence, additionality, and third-party verification to build trust in carbon markets. California as a policy leader with national and global spillover (Priority: 4/5): Wiener argues California’s climate policies often become national templates, influencing companies, regulators, and other states, while Samala notes buyers and compliance systems are already driving global demand for removals. Public-private collaboration and startup coalitions (Priority: 4/5): Both guests stress that startups need unified coalitions, NGOs, community groups, and policymakers to counter large incumbents and create practical climate policy and market demand. Future policy wish list: housing, transit, and carbon pricing (Priority: 3/5): Wiener prioritizes dense housing and world-class public transit to reduce emissions, while Samala backs SB 253 and SB 308 as foundational laws that could create durable demand for carbon removal.
Key Arguments: Climate impacts made climate change feel immediate and practical, not abstract, motivating both policy work and startup formation. Corporate emissions transparency is necessary because many firms have large scope 3 footprints and can otherwise market themselves as greener than they are. SB 253 matters because it applies to billion-dollar companies doing business in California and has national influence due to the state’s market size. Supply-chain data limitations are real, but the law was designed to be implementable by allowing estimated formulas when exact supplier data is unavailable. Carbon removal needs three standards: permanence, additionality, and measurement/verification; without them, markets risk credibility problems. High-quality carbon removals are gaining demand because companies and governments are realizing some emissions are hard or impossible to eliminate. Climate tech scale-up requires a flywheel of technology, policy, and capital; none alone is enough. Startup coalitions can be more persuasive than individual companies when countering incumbent lobbying and shaping policy. California policy often becomes a template for other states and countries, so local legislation can have outsized global impact. A future carbon market that requires polluters to pay could create a durable revenue stream for removals and help fund gigaton-scale deployment.
Data Points: Senate bills passed into law by Scott Wiener: 75 - Background on the senator’s legislative track record California State Senate District: 11 - Wiener represents San Francisco and surrounding areas Year Wiener took office in California State Senate: 2016 - His tenure in the legislature Year Wiener moved to San Francisco: 1997 - Personal background Heirloom founded: 2020 - Company formation timeline Direct air capture facility location: Tracy, California - Heirloom’s first commercial DAC facility Largest direct air capture deal with Microsoft: 315,000 tons of CO2 - Commercial offtake/removal agreement DOE or infrastructure-backed DAC hub capacity: Up to 1 million tons per year - Louisiana project with partners Corporate disclosure threshold in SB 253: $1 billion+ gross annual revenue - Companies required to disclose emissions Scope 3 share of emissions: 89% - Referenced as the portion omitted when the SEC narrowed its rule Alternative scope 3 estimate mentioned: 70% - Also cited in discussion of major corporate emissions share BART/commuter transit agencies named: BART, Muni, AC Transit, Caltrain - Wiener’s transit and housing climate priorities California net zero target referenced in SB 308: 2045 - Bill envisions requiring polluters to pay for remaining emissions by then Start of incremental polluter-pay requirement in SB 308: 2030 - Planned phase-in of carbon removal payments Targeted carbon removal need by 2030: 200 million tons - Samala’s estimate of scale needed Carbon dioxide atmospheric lifetime cited: 1,000 years - Used to justify permanence requirements for removals Typical climate-tech billing cost cited for disclosure compliance: Tens of thousands of dollars - Wiener’s point that compliance is not prohibitively expensive for many firms Live audience size: Over 250 people - SF Climate Week event attendance
Pivotal Quotes: "You can't fix what you can't measure." — Shashank Samala: On why SB 253 is foundational for climate tech and policy "It was three years of trench warfare just to the point where... the United States Chamber of Commerce and the American Petroleum Association... were fighting this bill" — Scott Wiener: Describing the political battle over SB 253 "We are all on the same team. We're all on team net zero." — Shashank Samala: On the need for coalition-building across climate startups and stakeholders
Implications: The episode shows that climate progress depends on measurable disclosure, credible removals, and coalitions that bridge startups, regulators, and communities. California policy can reshape markets well beyond the state and accelerate demand for carbon removal.