When creating a poem, I often find that first choosing a pattern of syllable counts can be very helpful in guiding me into careful word choices. I have used the Fibonacci numbers as a guide to forming the following lines. Information for these lines has come from a frightening story by Marcus Eriksen (March 23, 2021 in the Washington Post).
Don't allow more deaths
of desert camels, painful deaths
caused by eating humans' trash within its plastic bags --
chewed plastic not digestible --
causing ulcers and
lots of pain,
After a pair of 1's to start the sequence, each succeeding Fibonacci number is the sum of the preceding two numbers: Above we have (climbing and then reversing): 1, 1, 2, 3, 5, 8, 13, 8, 5, 3, 2, 1, 1.