A loud and raucous morning. What could I be?

I’m only alive if I’m feed. My diet consists of both fossil fuels and wood. My main duty is to heat, so you can eat.

Sun's embrace on glass, Frozen moments, nature's breath, Time's whisper captured.

I fix your mistakes but shrink each time. My purpose is to undo, to clean the slate and make it clear. What am I?

I'm old but still have shape. I can go down the stairs albeit I might be late. Gravity is my friend but I'm no physicist. I can't stand the fidget, this I tell my therapist. I know gravity very well. Gone are the days I reigned at show-and-tell.