This is something I keep trying to stress, to no avail, to The B&G, whose consumption of paper in recent times has been quite astonishing.
Dr Z brings it home in enormous quantities, sheets salvaged from the printers and photocopiers at work, these used on one side, still blank on the other and, in the main, destined for the bin.
These are perfect for The B&G, who can go through paper at a quite remarkable rate.
If they're not using it for drawing, painting or general scribbling, they're practising their letters and numbers.
The B has taken to copying out the words from his favourite train timetables, maps and books. This morning, he reproduced the BigJigs catalogue. Yesterday, it was the nutritional information from a cereal box. The G is keen on gluing random things to A4 sheets and loves to use her scissors to hack her creations into interesting shapes.
Both are partial to a paper plane.
On a particularly-productive day, several reams can be consumed, the paper pile in the playroom forever shrinking. Dr Z keeps bringing it home - but even she is struggling to keep up.
In terms educational and imaginative, this is all good, and The B&G's paper-based pastimes are to be encouraged. But it can't be considered good news for trees . . .