it affects the living things around it because when melting ice glaciers melt all the way and add on to the body of water it was in, then it could cause the body of water that it was in to overflow onto the near by land, therefore affecting the living things around it.
Living sustainably means that your way of living isn't harmful to the environment and you can "sustain" your way of living over a prolonged period of time. For example, if you cut down a tree you can always plant another.
