Luxury homes can be traditional or contemporary, ornate or minimalist, functional or fantastic, great or small, writes Christie’s International Real Estate in its online magazine luxurydefined. But even with such properties, environmental awareness does not have to mean “doing without”. Quite the contrary: chic, even dazzlingly beautiful homes around the world are sporting green roofs, drawing power from geothermal energy, and making use of solar panels year round. Green features also include humidity controlled indoor air, filtered drinking water, LED lighting, HEPA air filters, and “smart home” internet systems and controls. The technology we currently deem “eco-friendly” will probably be de rigueur in coming years.

To mark the 50th anniversary of Earth Day (April 22), we spotlight 10 eco-friendly amenities and a sampling of innovatively designed homes that offer the ultimate in luxury and sustainable living.