Five research insights from early-career climate leaders

At the inaugural Stanford Sustainability Forum, five early-career scholars offered a glimpse of what the next generation of climate progress needs – researchers who move fluidly between scientific questions and the policies, markets and systems that determine whether solutions actually work.

Some presenters found innovative ways to approach a sustainability challenge, like Edward Apraku's electrochemical system for turning wastewater nutrients into fertilizer. Others surfaced the gap between a good policy idea and its real-world implementation, like Evan Ludington's analysis of wildfire-proofing incentives and Sierra Rose Castañeda's investigation of cover cropping adoption.

Ludington, a master's student in Earth system science, showed that California's 2023 Safer from Wildfires regulation – which promises insurance discounts to homeowners who take fire-mitigation steps – falls well short of its intent. Completing all prescribed measures might yield less than $100 a year in savings per household, while a fire-rated roof retrofit costs upward of $10,000. The policy instrument is sound in theory, he argued. The calibration is off.

Sierra Rose Castañeda, a PhD student also in Earth system science, faced a similar gap between a good policy idea and its real-world uptake. She studies why cover cropping, despite its ability to reduce nitrate contamination in groundwater, has been adopted on only about 10% of eligible acreage in the Salinas Valley. The answer: the policy incentivizes winter planting, which clashes with farmers' schedules. Her field trial found that fall-terminated cover crops, planted earlier and grown for a shorter period, take up as much nitrogen as their winter counterparts – a finding that could open the door to policy adjustments that work better for growers.

Yingjie Li, a postdoctoral scholar with the Natural Capital Alliance, made the case for urban nature as a public health tool. Drawing on a sweeping synthesis of nearly 450 studies, he showed that green spaces significantly reduce anxiety, depression and stress. Even brief exposure makes a measurable difference. His team is also developing open-source tools to help urban planners quantify those benefits and make the case for investing in nature-based infrastructure.

June Choi, a PhD student in Earth system science who attended COP30 in Brazil, focused on what she calls the climate debt trap – the cycle by which climate-driven disasters raise borrowing costs, which reduce resilience investment, which worsen vulnerability. For small island states like Barbados, she estimated that roughly half of sovereign debt may be attributable to tropical cyclone exposure. While financial instruments like catastrophe bonds can offer partial relief, Choi noted that Jamaica's bond payout after Hurricane Melissa was $150 million against damages exceeding $10 billion.

Edward Apraku – who defended his PhD in environmental engineering the day before the panel – closed the session with research on recovering nitrogen and phosphorus from wastewater and converting them back into fertilizer. The industrial process that produces synthetic nitrogen uses staggering amounts of energy, and much of that nitrogen ends up in waterways anyway, fueling algae blooms and downstream pollution. Apraku's electrochemical system aims to close the loop.

The two-day forum, hosted by the Stanford Doerr School of Sustainability, brought together researchers, policymakers and cultural leaders – from celebrity chef José Andrés to former U.N. Secretary-General Ban Ki-moon – to take stock of the state of climate progress.