Global dimming

Global Dimming

Global dimming (/ˈɡloʊbəl ˈdɪmɪŋ/) is a term used to describe the decrease in the amounts of solar radiation reaching the surface of the Earth. This phenomenon has been observed since systematic measurements began in the 1950s.

Etymology

The term "global dimming" was first used in the scientific literature in 2001. It is derived from the English words "global", meaning worldwide, and "dimming", which refers to making or becoming less bright or distinct.

Definition

Global dimming involves the reduction in sunlight reaching the Earth's surface due to the increased particulate pollution in the atmosphere. These particles, or aerosols, can either absorb solar energy and radiate it back into space, or they can reflect incoming sunlight, preventing it from reaching the surface of the Earth.

Causes

The primary cause of global dimming is the emission of manmade pollutants, particularly sulfur dioxide, soot, and other particulates. These pollutants are primarily produced by the burning of fossil fuels such as coal, oil, and gas.

Effects

The effects of global dimming are wide-ranging and potentially severe. They include changes in rainfall patterns, reduced crop yields, and an increase in health problems related to poor air quality.

Related Terms

• Global warming
• Climate change
• Greenhouse effect
• Air pollution
• Aerosols

External links

• Medical encyclopedia article on Global dimming
• Wikipedia's article - Global dimming

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