The planet as a whole is warming, but the term acknowledges that the short-term variations in this process can include both higher and lower temperatures, despite the overarching trend toward warmth.

The answer is 'climate change'.

Explanation:

The warming of the whole planet is known as global warming. It can be defined as the average increase in the mean global average temperature over a series of longer spans of time such as decades or centuries.

Climate change at a place is a term that indicated variations in average temperature over shorter periods of time such as years or months and his trend can be in both directions increase or decrease in the mean annual or mean monthly temperature for a particular period.

spectral lines lyman is one set