The Federal Government has applied for 74,000 hectares - about half the area added last year - to be de-listed.
The committee voted unanimously to include the area but is now considering Canberra's request, with a ruling expected at a meeting in Doha, Qatar, on Saturday.
Just last year 120,000 hectares of forest were added to a UN World Heritage Area.
But according to the federal government, 74,000 hectares of that don't need protection - a claim that has environmentalists up in arms.
"We have trees here that are 100m tall", Environment Tasmania CEO Charlie Sherwin says.
"They are the tallest hardwood trees on earth. Some of them fell from seed when Leonardo was painting the Mona Lisa."
The forest in question covers areas of the Upper Derwent, the Florentine and Huon Valleys, and the Hartz Mountains.
Extended herritage protection is part of a deal that environmentalists and state forestry struck after years of tense negotiation - but Tasmania's newly-elected Premier Will Hodgman is on record as saying that the deal 'won't stop us with getting on with the job of reopening the forest industry.'
Hodgman's main aim is passing a law demolishing the Tasmanian Forests Agreement - something Charlie Sherwin says could set a dangerous precedent.
But if protection is repealed the worry is it'll set a dangerous precedent.
"Look we want to see the convention upheld. Australia was one of the first signatories to the World Heritage Convention. In 1974 we ratified it - we led the world back then in nature conservation."
Last month, two reports advised the UN to reject the Abbott Government's application, noting it contained no detailed justifications or explanations.
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