Climate change threatens human well-being and planetary health but is hardly addressed in education. Comparative education research has advised governments about education reforms since the nineteenth century, so what must change to sustain a liveable earth? I use the concept of 'educational space' to understand how comparative knowledge building has steered education. Then I re-read three volumes of the "World Yearbook of Education (WYB)" to show how comparative education has embedded knowledges that have steered governing, neglected experiences that complicate powerlessness, and constrained learning through measurement. I argue current education compromises humans facing challenging climate futures but could provide knowledges to support 'the other'.