What is the purpose of the on-screen text in the video "2016 Was the Warmest Year on Record Part 2"?

2016 Was the Warmest Year on Record Part 2

Responses

to describe the images being shown in the video 
to describe the images being shown in the video 

to explain where the temperature data comes from 
to explain where the temperature data comes from 

to show how temperatures around the world are increasing 
to show how temperatures around the world are increasing 

to tell where all the weather stations are located