2 minute read


biochar (BYE-oh-char): a charcoal made when biomass is burned in an oxygen-free environment

biofuels (BYE-oh-fyoo-uhlz): plant material, manure, and other organic materials used as fuel

biomass (BYE-oh-mass): organic matter; matter that comes from living things, such as plant material and animal waste

ecological footprint (ee-kuh-LOJ-uh-kuhl FUT-print): a measure of how much of the Earth's resources are needed to support a person or a particular nation

fossil fuels (FOSS-uhl FYOO-uhlz): coal, oil, and natural gas, formed from the remains of prehistoric organisms

global warming (GLOH-buhl WORM-ing): a gradual increase in the average global temperature

greenhouse gas (GREEN-houss GASS): a gas such as carbon dioxide or methane that holds heat in the Earth's atmosphere

human footprint (HYOO-muhn FUT-print): the ecological impact of a person's life on Earth

industrial revolution (in-DUHSS-tree-uhl rev-uh-LOO-shuhn): a major change in society that came about when machines, powered by fossil fuels, were used to produce food and other products

non-renewable energy (non-ri-NOO-uh-buhl EN-ur-jee): energy sources that are limited, such as the fossil fuels coal, oil, and natural gas

recycle (ree-SYE-kuhl): to collect waste materials and use them to produce new items

reduce (ri-DOOSS): make smaller

renewable energy (ri-NOO-uh-buhl EN-ur-jee): a source of energy that can never be used up, such as energy from the wind, waves, and the Sun

solar energy (SOH-lur EN-ur-jee): energy from the Sun

solid waste (SOL-id WAYST): discarded solid material; garbage


biochar 43

biomass 25, 42

carbon neutral 25

Carson, Rachel 21

ecological footprint 6

fossil fuel(s) 8, 10, 12, 15, 22

global warming 10, 14, 43

greenhouse gas(es) 10, 11, 13, 14

human footprint 4, 5

hydroelectric power 24

industrial revolution 8

non-renewable energy 22

rain forest(s) 16, 17, 18

recycle 32, 34, 35, 37

reduce 14, 15, 20, 28, 32, 34, 39, 40, 41, 44

renewable energy 15, 22, 24, 26

sewage 43

solar energy 12, 22, 23

solid waste 30, 32, 33

wind power 24

Websites to Visit






Additional topics

Science Encyclopedia for KidsOur Footprint on Earth