Why does Scrooge beg the ghost to take him home?

I'm thinking you mean Stave 2. Scrooge is shown an older version of himself in the prime of life. His face shows the first signs of greed as he sits by a crying girl, Belle. She breaks off their romance, reproaching him for replacing his love for her with the pursuit of money. The scene changes and Belle is now the mother of a raucous, affectionate brood of children. Her husband comes home and tells her he saw Scrooge sitting alone in his office. Scrooge begs the Ghost to take him back to his own time to his home.