Does fire ever do any harm nowadays? Why do we need to be careful in using fire?

How the Tree-dwellers Formed a Clan

The next night One-Ear stayed with Sharptooth and Bodo at the foot of the old oak.

Then other Tree-dwellers came.

At first they were afraid just as Sharptooth had been.

But they, too, soon learned that the fire was their friend.

So they sat around the fire each evening.

They talked about the wild animals they had seen.

As long as they sat by the fire, they felt safe.

So they came to the fireplace each night.