green comet noun [C]
UK /ˌgriːn ˈkɒm.ɪt / US /ˌgriːnˈkɑː.mɪt/
a type of comet (= an object that moves around the sun that is seen on rare occasions from the earth as a bright line in the sky) that has a green glow because of radiation from the sun

A green comet that will be visible from Earth for the first time since the Ice Age appears to be undergoing unusual changes. Comet ZTF has created excitement in recent weeks as it has hurtled towards Earth, coming close enough to the planet that it should be visible to the naked eye. It will be the first close approach for 50,000 years, and will reach its closest point on 1 February.
[independent.co.uk, 21 January 2023]

green gentrification noun [U]
UK /ˌgriːn ˌdʒen.trɪ.fɪˈkeɪ.ʃən / US /ˌgriːn ˌdʒen.trə.fəˈkeɪ.ʃən/
the process by which a place changes from being a poor area to a richer one because measures taken to make the area more environmentally friendly have made it a more desirable place to live and have caused house prices etc. to increase

As neighborhoods become greener, they also become more attractive… and more expensive. In several cities around the world, neighborhoods that have benefited from environmental greening are becoming an object of desire among real estate professionals, who raise the price of housing, thus attracting a new, wealthier segment of the population. This process is called “green gentrification.”
[forbesindia.com, 28 September 2022]

green noise noun [U]
/ˌgriːn ˈnɔɪz/
a mixture of sounds or electrical signals that resembles sounds heard in nature, such as waterfalls or rustling leaves, and is thought to help people to relax

“Green noise is a variation of white noise in the middle of the spectrum,” sleep expert Martin Seeley says. “But as its name suggests, many of the sounds are what we would consider nature. Some great examples of green noise can be the sound of water on a beach, or trickling waterfalls – anything that is attuned to nature and promotes relaxation.”
[glamourmagazine.co.uk, 10 December 2022]

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