Both inventions were done by teenagers at their times.
Both inventions claimed to help the environment: Boyan Slat's machine would clean up trash floating in ocean. Duro-Aina Adebola, Akindele Abiola, Faleke Oluwatoyin, and Bello Eniola proposed power generation from urine that would not create carbon monoxide.
Unfortunately both inventions were also challenged by more established scientists and engineers.
Answer: The Death of the Ball Turret Gunner is a poem that is told as a flashback.
Explanation: Ball Turret Gunner is a veteran, recounting his real feelings on the subject of war
Major details are 1, 2, and 4
I think the answer is cheerful.