Adaptation to climate change and economic growth in developing countries

Developing countries are vulnerable to the adverse effects of climate change, yet there is disagreement about what they should do to protect themselves from antic- ipated damages. In particular, it is unclear what the optimal balance is between investments in traditional productive capital (which increases output but is vulner- able to climate change), and investments in adaptive capital (which is unproductive in the absence of climate change, but ‘climate-proofs’ vulnerable capital). We show that, while it is unlikely that the optimal strategy involves no investment in adapta- tion, the scale and composition of optimal investments depends on empirical context. Our application to sub-Saharan Africa suggests, however, that in most contingencies it will be optimal to grow the adaptive sector more rapidly than the vulnerable sector over the coming decades, although it never exceeds 1% of the economy. Our sensi- tivity analysis goes well beyond the existing literature in evaluating the robustness of this finding.