Answer:
If you lose me you may cause people around you to lose me too.
The warmer I am, the fresher I am. What am I?
I am the word that is always spelled correctly by everyone.
Never resting, never still. Moving silently from hill to hill. It does not walk, run or trot. All is cool where it is not. What is it?
I regularly change shape yet remain a sphere. I am always there but not often seen. What am I?
The answer I give is yes, but what I mean is no. What was the question?