Columbia subject headings:
Climatic changes--History.
Europe--Colonies--History.
Harvard subject headings:
Climatic changes--History.
Ecology--History
Environmental policy--Colonies--Europe--History.
Environmental policy--Europe--Colonies--History.
Europe--Colonies--History.
Imperialism--History
Princeton subject headings:
Climatic changes--History.
Ecology--History.
Environmental policy--Europe--Colonies--History.
Imperialism--History.