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'Green' architecture focuses primarily on building tactics that don't adversely impact the earth, use less energy, and often use recycled/re-purposed materials. Examples of green architecture could be using geothermal heating instead of electric or gas, or installing solar panels to offset the power demands of your building.
'Green' architecture can also be very literal - utilizing roof space as a roof garden (either cultivated or wild) which not only reduces the rain runoff of your building (lessening your impact on the city's storm sewers) but also reduces heating and cooling costs, and adds pleasing aesthetic elements to your building. Why not go truly green and grow vegetables on your roof?!
Realistically, green architecture is anything that:
-reduces your impact on the earth
-uses recycled/re-purposed materials
-transforms an existing building into usable space
-uses less energy to run
-creates its own energy
-heats/cools a building through creative means
-results in less pollution than conventional architecture
