What on earth ..
The pupils made their presentations as part of the Our Environment, Our Future event, designed to allow youngsters to feed into decision-making around issues such as climate change, flooding and renewable energy.
At Portobello High, the chamber was told, there are water hippos in the toilets, a greenhouse on the eighth floor, an allotment and revamped bike sheds to encourage pupils to cycle to school.
At Inverkeithing High, pupils have been focusing on their school's energy consumption. A reward system for teachers who turn off classroom computers and lights is in place. Those who comply are given cookies; those who don't, get wooden spoons and are named and shamed on the school's website.
"Computers are on roughly eight hours a day," Rachel Swift, an S5 pupil, explained. "The energy cost per day of one computer comes to pound;1, so if you multiply that by 300, you can see the problem."
Meanwhile, pupils at Peebles High are avid recyclers. According to one, as well as improving your green credentials, recycling has another advantage - time out of class.