Biogeography: life-form and distribution; Mediterranean-type ecosystems; invasions; geogenetics; conservation-biogeographical aspects; climate change and ecosystems.
Plant ecology: succession theory; seed ecology; species-diversity; plant strategies.
Environmental history: agricultural origins; the Columbian exchange; desertification; history of environmental thought; California; the Middle East.
Social theory: diffusion vs. independent invention and cultural change; environmental vs. social factors in cultural change; Western influences on critical social theory; Carl Barks.