I consider myself at least slightly environmentally concerned, but this stapler without staples would make sense and fun no matter how much you care about your carbon print. Press the magic button and presto! The magic machine makes a hole in your paper corner and inserts a tab into it for holding it all together. I must admit, this is not strong enough to survive an air crash or a strong wind but it is still fun!
It was quite fun for me, for the first time reading my writings in an American journal. I have written about the bird tetrahedron in Norwegian in Tangenten (2005) and I recently elaborated on this topic and expanded the original article into a new one for MT. You can read the English version on jstor or the august issue of Mathematics Teacher from NCTM. I loved the way they made those nice graphics and photos for the front and illustrations! There are also some templates you download in PDF from the Mathematics Teacher website.