Climate Scientist: I want a tool to examine Climate Temperatures.
Geek: How do you define Climate?
Climate Scientist: Longer than 10 years or so.
Geek: So you want a tool that will show how the planet’s temperature responds in periods of more than 10 years or so?
Climate Scientist: Yes.
Geek: Well basic theory says that a Low Pass filter with a corner frequency of 15 years will do exactly what you want.
Climate Scientist: But that’s not complicated enough and anyway that does not show me what I like to see. It says that there are natural oscillations in the signal and my theory says they don’t exist.