I don’t have stairs in my apartment so I haven’t needed to purchase a safety gate for my daughter. If I did though, this one seems to fit the bill environmentally.
The Nature Text Bamboo Gate is made from bamboo and 100% recycled materials. It can be used in doorways and openings anywhere from 28 – 42 inches wide and is 24 inches tall. The Nature Text Bamboo Gate can be purchased at Amazon and directly through Safety First Shop.