Have you forgotten all you ever learned about climate change? What do you really know about GM foods? Can you remember everything you learned at school about earthquakes? This useful guide reminds you of everything you once learned – or should have learned – about the earth, its resources and atmosphere, and human activity and its effects. Discover the physical world of rivers, glaciers and coasts; the human world of population changes and migration; agriculture, including farming, GM foods and the green revolution; and industry, from tourism to ports and old industry. I Used To Know That: Geography is an accessible yet fun way to revisit all the stuff you have forgotten from your school days but really should remember.