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the atmospheric circulation around Earth that occurs in predictable patterns

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the properties of the atmosphere at a given time and location, including temperature, air movement and precipitation

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the gaseous form of water; produced when water evaporates

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the slow warming of Earth's atmosphere due to climatic change

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the continual movement of water between the land, ocean, and the air

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in weather, the boundary between two masses of air with different properties

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water that is released from clouds in the sky; includes rain, snow, sleet, hail, and freezing rain

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the process in which matter changes from a liquid to a gas (related word: evaporate)

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to put harmful materials into the air, water, or soil (related words: pollution, pollutant)

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pollution discharged into the atmosphere from a variety of sources

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large-scale movement of water within the oceans in a certain direction

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the study of patterns of weather

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water stored below Earth's surface in soil and rock layers

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warming of air due to gases that cause less heat to be reflected than absorbed

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Greenhouse gases are gases that absorb heat from Earth and then send it back, making Earth warmer. These gases include water vapor, carbon dioxide, methane, and nitrous oxide. They are called greenhouse gases because they are similar to the glass walls of a botanical greenhouse that trap heat and warm the air inside the greenhouse. This process is known as the greenhouse effect, and some scientists believe it has contributed to global warming in recent decades. Global warming is the gradual increase in the temperature of Earth.

Some greenhouse gases are emitted naturally. However, greenhouse gases are also emitted when fossil fuels, such as petroleum and coal, are burned. Many people believe that humans need to use alternative fuels so they will burn fewer greenhouse gases. They believe that doing this could slow down the rate of global warming.

North Africa and Southwest Asia are large producers of fossil fuels. If people start to use less coal and petroleum in an attempt to reduce greenhouse gases, the economies of North Africa and Southwest Asia could suffer. The same is true of the economies of China and North America. Scientists have reported that these two countries are the world’s largest producers of greenhouse gases. For all areas of the world, alternative fuels may someday be the only way to decrease greenhouse gas output without negatively impacting people or the world's economies.

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a large-scale, long-term, change to Earth's regional or global weather systems

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the current or past long-term weather conditions characteristic of a region or the entire Earth.

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a waste product made by cells of the body; a gas in the air made of carbon and oxygen atoms: Humans rid themselves of carbon dioxide waste by exhaling, or breathing out.

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the force that air puts on an area (related word: pressure)

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the force that air puts on an area (related word: pressure)