Examples:
For an argument about climate change:
Imagine you are in your bed on a hot, muggy morning. What would you do? You'd kick off your blankets, get a glass of ice water, and go turn on the fan. But, if you were the Earth, you couldn't do this. There would be no way for you to cool down.
For an argument about cleaning up the oceans:
Picture this. You have flown down to Hawaii for a lovely beach vacation. You run down to the water and splash in, only to find a piece of net wrapped around your leg and a dead fish floating beside a plastic bottle.
For the counterargument "You will forget to walk the dog:"
Think of this. It is after a long day. When you come in the door, you see those warm brown eyes and that wagging tail and your heart melts. Even though you are tired, you take the leash out of your dog's mouth as she jumps up excitedly. Of course, you will take her for a walk. You can't ignore such an energetic reminder; no one could.