This document discusses how macroevolutionary perspectives on niche evolution can provide insights into how organisms adapt to climate change over long timescales. It uses the seaweed genera Dictyota and Codium as case studies, analyzing their thermal niche evolution and diversification rates in relation to inferred past climate changes. The results provide some evidence that niches can adaptively trace climate shifts, and higher diversification occurs in warmer temperature regimes, though many uncertainties remain that could be addressed in future work.