Before their peers, teachers and La Trobe MP Jason Wood, several year 9 Berwick students spoke out about solar power, hydropower, tidal, wind and geothermal - outlining their preference and why they would chose that particular source for Australia.

Beaconhills business manager David Young discussed the college's carbon footprint in terms of water and power usage and how they could improve it.

"With our water tanks and a range of efficiency measures, which includes upgrading our water infrastructure, toilet systems and replacement of obsolete fittings we've reduced consumption by 45 per cent, and hope to reduce it by another 30 per cent."

Reducing the school's electricity use was the next important green project, Mr Young said.

The school had already taken measures to cut down usage, including using cut-out timer switches for computer labs.

"We have successfully tried out solar systems at our Pakenham campus that generate power to buildings, and are looking at the same for this campus," Mr Young said.

The school also has a weather station, which shows weather patterns to allow staff and students to work out which green technology - such as wind power or solar - would be best suited to generate power throughout the school.

Science and maths teacher Helen Comport said different means of alternative power was suited to different areas.

"We noticed we don't get as much wind here as our Pakenham campus, so solar could be better than a wind turbine."

At the end of each student's presentation, Mr Wood quizzed them on their choices and congratulated them on their understanding of the issue.

He also encouraged them to be proactive on environmental issues.

"You have a voice to change things - write to local MPs and newspapers."