Which statement best captures the distinguishing feature of the approach advocated by Farmer et al. (2015) in climate economics?

• A. It relies on linear, deterministic models that ignore uncertainty.
• B. It asserts that traditional models are sufficient for policy design.
• C. It downplays the role of systemic risk in the economy.
• D. It emphasizes complexity and non-linearity in climate impacts.

Answer: (D)

The distinguishing feature is treating climate-economy interactions as a complex, adaptive system with non-linear dynamics and potential tipping points. Farmer and colleagues argue that outcomes aren’t well captured by smooth, linear projections because the economy and climate influence each other through interconnected networks, feedback loops, and thresholds. This means risks are often heavy-tailed and uncertain in a structural way, not just in a simple probabilistic sense. Policy implications follow: focus on robustness, flexibility, and scenario-based planning, rather than assuming a single, well-behaved forecast.

This view stands apart from linear, deterministic modeling that ignores uncertainty, from the idea that traditional models are enough for policy design, and from downplaying systemic risk. Instead, it centers on how small changes can trigger disproportionate, cascading effects across sectors and time, making complex, non-linear thinking essential for climate economics.