Resource productivity is a fancy way of talking about using things we need, like water and energy, in the best way possible. Think of it like a puzzle - we want to use as little of these things as we can to get the most out of them.
One way to do this is by being smart about how we use them. Turning off the lights when we leave a room or taking shorter showers to save water are good ways to be resourceful - it means we can use less of them and make them last longer.
Another way to improve resource productivity is to find new ways to use resources over and over again. Instead of just throwing something away when we're done with it, we can find creative ways to use it again, like recycling plastic bottles or turning food scraps into compost.
By being clever and using resources in the best way possible, we can make sure we have enough for everyone to share, even if there are lots of people on the planet. And that's a very good thing indeed!