That is not exactly true.
NYTimes article a year ago did notice it. Actually they didn't notice it, they just quoted a local official who complained
He said China’s neighbors in the South China Sea could lose up to $100 million a year because of the loss of the coral reefs, which are breeding grounds for high-value fish harvested by countries surrounding the sea.
Land "reclamation"? That implies that these places were once islands and are being restored. HELLO. They are shoals and never were islands, and the "reclamation" is destroying the ecology of the region.
China has been undertaking land reclamation projects on the sand spits, islets and submerged reefs of the Spratly Islands in the South China Sea, according to satellite images
The rest of the article is about the yearly PhilAm military exercizes that are now upsetting China, even though they have gone on every year since I have lived here (11 years).
local environmentalists have complained and demonstrated, as have local fishermen. Also from last year:
The environmental group said that China’s military activities in the disputed area will ”increase the risk of coral reef destruction, toxic and hazardous waste dumping, and the depletion of fisheries.”