earth-friendly; ecological; sustainable
A set phrase used to describe products, actions, or lifestyles that are kind to the environment. Often used in advertising and everyday speech.
This detergent is made with earth-friendly ingredients.
I try to live an eco-friendly lifestyle.
環境に優しい is a near-synonym meaning 'environmentally friendly', but 地球に優しい specifically personifies the Earth.
A modern set phrase combining 地球 (Earth) + に (particle) + 優しい (kind/gentle), literally 'kind to the Earth'. It became popular with the rise of environmental awareness.