climate change – n. a change in the world's climate patterns attributed largely to the increased levels of atmospheric carbon dioxide produced by the use of fossil fuels

microbe – n. an extremely small living thing that can only be seen with a microscope

author – n. a person who has written something

fungus – n. any one of a group of living things that often look like plants but live on dead or decaying things (plural: fungi)

carbon dioxide – n. a gas that is produced when people and animals breathe out or when fossil fuels are burned and that is used by plants for energy

cycle – n. a set of events or actions that happen again and again in the same order

fingerprint – n. a distinctive or identifying mark or characteristic