Greenhouse gas. A greenhouse gas (abbrev. GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in Earth's atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, and ozone.
A musician is a person who plays a musical instrument like a guitar or a piano or a person that sings. A musician is also someone who writes music, even if they write it for other people to play. People who write music are called composers. Usually that part is left out if they also play or sing the music they write, but they are still composers because they wrote the music.
A lyricist, also called lyric writer or wordsmith, is someone who writes the words to an original piece of music or adds words to already existing music. lyricist is a person who has a way with words, so to speak. He is able to come up with words that effectively suits a particular type of music keeping in mind the genre, theme, length and rhythm of the music.