The crossword solution for the term 'PART OF A GREEN MANTRA' is REUSE. REUSE is an important part of a green mantra, which is a set of principles that promote sustainability and environmental protection. Reusing items instead of throwing them away helps to reduce waste and conserve resources. REUSE is also an important part of the 'reduce, REUSE, recycle' mantra, which encourages people to reduce their consumption, REUSE items whenever possible, and recycle materials that cannot be reused.