m16.    How are forests of commercial importance?

Fifth-three percent of the world's commercial timber comes from the US, the Commonwealth of Independent States, and Canada. Of that, lumber accounts for ¹/₃ of the timber cut; fuel wood is ½; pulp composes ¹/₆; and the rest is used for medicines and other products (oil, tea, perfume, food products).

e01.    What is biodiversity?

e03.    How do pathogens and insects affect trees?

e11.    What types of old-growth forests are there?

e13.    What is biomass?

g05.    How are forests of geological importance?

g07.    How did plate tectonics affect the diversity of ecosystems?

g17.    Is some matter more useful than other matter?

g18.    What is energy?