ˌcarbon ˈneutral adjective
if an organization or activity is carbon neutral, it takes the same amount of carbon dioxide out of the air, for example by planting trees, as the amount it produces. This is done in order to avoid harming the environment:
Costa Rica wants to be the first developing country to become carbon neutral.

[TahlilGaran] Dictionary of Contemporary English ▲

environmentally friendly not harmful to the environment:
Cycling is very environmentally friendly.
environmentally friendly holidays
Is there such a thing as an environmentally friendly car?
eco-friendly [usually before noun] not harmful to the environment – used especially about products:
We always try to use eco-friendly cleaning products.
eco-friendly coffins made from newspapers
green [usually before noun] not harmful to the environment – used especially in the following phrases:
green products
green technology
green energy
It was voted the greenest building in Britain.
clean [usually before noun] clean fuels or forms of energy do not release any harmful substances into the atmosphere:
We need cleaner fuels for cars and other road vehicles.
clean energy sources such as solar panels and wind turbines
renewable renewable energy comes from sources that can be easily replaced naturally, so that there is always more available:
The building is heated using renewable energy from the sun.
The government needs to invest more in renewable energy sources.
Wind power is renewable and produces no greenhouse gases during operation.
sustainable using the earth’s resources, without causing damage to the environment – used especially about farming, ways of living, and development:
The flowers are produced to high environmental standards using sustainable farming methods.
Many people want to lead more sustainable lifestyles and to conserve the planet’s resources.
sustainable use of the world’s resources
carbon-neutral balancing the amount of carbon gases that you put into the earth’s atmosphere with other activities that will effectively reduce the amount of carbon gases, for example by planting trees:
a carbon-neutral company
Stirling is aiming to become the UK’s first carbon neutral city.
All new homes will be carbon-neutral.
low-carbon [usually before noun] producing only a small amount of carbon:
Research is being done into the development of low-carbon electricity.
We will need to have a low-carbon economy.
low-energy [usually before noun] low-energy buildings and lightbulbs use very little energy:
Position is a key factor in the design of a low-energy house.

[TahlilGaran] English Thesaurus ▲