Evidence-based policymaking is often promoted within liberal democracies as the best means for government to balance political values with technical considerations. Under the evidence-based mandate, both experts and non-experts often assume that policy problems are sufficiently tractable and that experts can provide impartial and usable advice to government so that problems like climate change adaptation can be effectively addressed; at least, where there is political will to do so. This book compares the politics and science informing climate adaptation policy in Australia and the UK to understand how realistic these expectations are in practice.