Changes

A ''greenhouse'' is an plant nursery enclosed in glass to keep in warm air. The heat comes from sunlight's [[infrared]] spectrum, which is used in the heat lamps that keep McDonald's [[french fries]] warm. Instead of blowing away, the air remains inside.

A '''greenhouse''' is an plant nursery enclosed in glass to keep in warm air. The heat comes from sunlight's [[infrared]] spectrum, which is used in the heat lamps that keep McDonald's [[french fries]] warm. Instead of blowing away, the air remains inside.

 

Many science writers have likened the earth's atmosphere to a greenhouse, an unfortunate analogy that obscures the way the atmosphere retains heat (see [[Greenhouse effect]]).