The part of the sentence 'are ecologically sound' is correct and usable in written English.
You could use it to refer to activities, products or policies that have a minimal impact on the environment. For example: "The appliances in our new office are ecologically sound and consume a fraction of the energy of our old models".
"There are ecologically sound reasons for the Pemón to keep fuel levels on the savanna low," he said.
Critics praise her for bringing the artifice and irony of contemporary art to the public realm, but some also wonder if her landscapes are ecologically sound or user-friendly.
…California Indian land management practices are ecologically sound and even necessary for maintaining the delicate ecosystems across the state" (LeBeau 1998).
Researchers have found that the cultural and biological pest controls are ecologically sound and could provide solutions that are sustainable in the long term [19, 20].
"They're ecologically sound.
"We have to demonstrate our technology is ecologically sound and we are moving forward.
When environmentalism went mainstream, green was hijacked by businesses as a visual clue to suggest that this, that or the other product was ecologically sound.
The debate over the project reflects a concern throughout the Mediterranean, which is now facing drought and scorching heat waves: can a resort built on fragile land be ecologically sound?
Hidden away on the other side of the Adige river is the newly opened Casa & Natura (00 39 045 800 5053; casaenatura.progettoindue.com, €135), an organic B&B where everything from the homemade jam to the soaps and sheets is ecologically sound, and all rooms are equipped with a pair of bikes for greener sightseeing.
The management practices used in agriculture must be ecologically sound and promote a soil food web capable of keeping populations of plant-parasitic nematodes below the economic damage threshold (Stirling 2014).
In addition to being ecologically sound, going green will save each family a couple thousand dollars a year.
