This is a poster to rise the awareness of global warming. The designer uses earth as a candle burning to imply heat. Also the candles often melts quiet slow, so the designer trying to express global warming is destroying our earth slowly.
Make the promise to yourself, to Never EVER speak to your children in a way that you wouldn't want to be spoken to. No matter how irritated you get or exhausted you are, keep your temper low, you'll thank yourself later.