​Caused or influenced by people, either directly or indirectly.

​​anthropogenic

​The long-term changes in global temperatures and other characteristics of the atmosphere.

​​climate change

The process of specific gases trapping the Sun's heat on the planet.

​​greenhouse effect

​A gas in the atmosphere that stops heat energy from escaping the planet.

​​greenhouse gas

​A long-term chemical change in the ocean's acidity due to the absorption of carbon dioxide from the atmosphere.

​​ocean acidification

​A measure of how acidic or basic the substance is; scale goes from 0, most acidic, to 14, most basic, with 7 being neutral.

​​pH

A heated material expands due to its atoms moving faster.

thermal expansion

The process of plants releasing water vapor to the atmosphere.

​

transpiration