Donations left by a desert robot could help create an oasis.
The same cannot be said, however, for humans leaving their “mark” and their tissues in nature.
Enter an Israeli design student’s sustainable toilet paper. Made from oranges and aloe vera, each individual leaf is woven with plant seeds such as mint, rose or parsley.
Though thicker than traditional tissue, its citrus content means it decomposes quickly when combined with the E.coli bacteria found in human excrement.
Additional nutrients in the faeces help fertilise the seeds. Since each paper is woven with only one kind of seed, travellers can adjust their choice according to the surrounding landscape.