GLOBAL WARMING Gradual rise in the temperature of Earth’s surface due to high levels of greenhouse gases, such as carbon dioxide.

GREENHOUSE GASES Gases such as methane or carbon dioxide that trap heat from the Sun. The heat in these gases makes the planet warm up at a higher rate, causing global warming.

HABITAT Environment in which a plant grows or an animal lives.

INDUSTRIALIZATION When lots of factories are built in an area.

LANDFILL Area where rubbish is taken and buried.

LIVESTOCK Animals that are kept on a farm, for example, cows or sheep.

MANGROVE FORESTS A group of trees and shrubs that grow along coastlines in slow-moving water.

MONTREAL PROTOCOL An international agreement to protect the ozone layer by eliminating the use of harmful products, such as CFCs.

NUCLEAR Something that uses the power created when the nucleus (central part) of an atom is split or combined.

INDUSTRIAL REVOLUTION Period of time during the 18th century when many societies started building and using factories to make objects and food rather than making them by hand. Many rural areas were also urbanized, and railroads were built.

OCEAN ACIDIFICATION When the sea becomes acidic because it has absorbed carbon dioxide from the air. The more carbon dioxide in the air, the more acidic the ocean becomes.

ORGANIC Something that has been farmed in a sustainable way or using natural products, rather than artificial chemicals, such as fertilizers.