In the face of increasingly likely dangerous climate change, many developing countries are designing green economy or low-emissions development strategies, but are simultaneously on a course of investment locking them into high-emission infrastructure. Meanwhile, many high-income countries are working to reduce their emissions but are hampered by the cost of switching from an existing capital stock designed for a fossil fuel-based economy. This paper looks at economic aspects of the challenge of escaping carbon lock-in using a “brown-green capital” model. In the model, brown capital is more productive than green capital in a brown capital-dominated economy, while green capital is more productive in a green capital-dominated economy; that is, the model allows for “carbon lock-out”. The paper also explores possible macroeconomic consequences of policies to drive a transition to a low-carbon economy and policy responses in the case that macroeconomic imbalances result.
