The Gladstone Ports Corporation is exerting efforts to have its harbour removed from the World Heritage List so that it could continue with its dredging operations sans international scrutiny, according to the Greens.

The Gladstone Ports Corporation has sent a letter to state and federal MPs asking for their support in delisting the harbour from the conservation list, ABC reports.

Greens Senator Larissa Waters told ABC the move is nothing but a scheme to justify dredging which is suspected of killing marine life in the region.

"This latest letter by the Gladstone Ports Corporation asking for the Harbour to be removed from World Heritage listing is frankly just an admission that this dredging is an environmental disaster," she said.

Meanwhile, the World Heritage Committee is sending a team to Australia to investigate the $16-billion LNG site at Gladstone and a massive port expansion along the east coast.

Greens Senator Larissa Waters says it is the latest dirty tactic being used to justify dredging which is suspected of killing marine life in the region. She slammed the ports corporation for going to state and federal MPs while skipping her office as she has been one of the most serious critics against dredging.

"It is on the World Heritage list for a reason and it needs to stay there and be treated properly.

"[It needs] to not just be treated like an underwater open-cut mine.

"We had 75,000 people sign a letter after that Four Corners expose calling on the Federal Minister to stop the dredging," Ms. Waters told ABC.