Yet again following a widely publicised allegation of tree spiking and the Premier's blaming of environmentalists, Tasmania Police have found no offence could be established because of a lack of evidence, the Australian Greens said.

"Whilst I welcome Tasmania Police's confirmation that no evidence of tree spiking was found and so no offence could be established, Tasmania Police needs to tell the public why no evidence was found when the Premier Lara Giddings said she had seen the tree spikes," Australian Greens Deputy Leader, Senator Christine Milne, said.

Calculations in today's Independent Verification Group's report that protecting Tasmania's forests high conservation value forests would store 8 million tonnes of carbon are yet another reason for Australia to lift its sights to more ambitious climate action, the Australian Greens said.

"Protecting our magnificent forests makes sense for our wildlife, for our economy and for our climate," Australian Greens Deputy Leader, Senator Christine Milne, said.

Liberal Leader Will Hodgman has embarrassed himself and the Liberals by recycling one of former Liberal Premier Ray Groom's failed policies, Australian Greens Deputy Leader Christine Milne said today.

"Not only is it a King Canute strategy to try to prevent dissent against logging of native forests in an age when this is seen as increasingly ecologically abhorrent, but it is also embarrassing since it highlights a big Liberal failure.

"It failed once and it will fail again as it will infringe national competition policy.

Released footage of a diseased Tasmanian devil in an area of the Tarkine earmarked for mining development shows there is an urgent need for federal government intervention before the devil slides into extinction, Australian Greens Deputy Leader, Christine Milne said today.

"This is the news that has long been feared. The Tasmanian devil's final disease free stronghold in the Tarkine has now been breached.

Forestry Tasmania's over cutting of Tasmania's native forests has been exposed in the leaks around the independent analysis of wood supply contracts as part of the Intergovernmental Agreement, Australian Greens Deputy Leader Christine Milne said today.

"What has become clear is that Forestry Tasmania has overcut and over allocated the forest to such an extent that even with the retirement of two thirds of its contracted volume via Gunns, Forestry Tasmania cannot meet the remaining one third of its obligations.

When I developed the Tasmanian Business and Industry Strategy in the 1990's to transform our failing economy from a dig it up and cut it down "quarry" to one based on our world renowned natural advantages, I emphasised that "Clean and Green" would only be successful, if it was authentic.

You cannot sell a lie and get away with it indefinitely. Protection of the brand is all important in business and it is all important to Tasmania.

Christine Milne press conference on Rob Oakeshott's misleading forest furnaces letter

Australian Greens Deputy Leader Christine Milne is writing to independents Tony Windsor and Rob Oakeshott to ask them to reconsider their breach of the carbon package agreement.

"Mr Oakeshott has moved, and Mr Windsor has seconded, a motion to disallow the regulation enacting the Multi-Party Climate Change Committee's unanimous decision to prohibit forest furnaces from gaining renewable energy credits.

Rob Oakeshott, seconded by Tony Windsor, moved today to disallow regulations that are a key part of the Multi-Party Climate Change Committee's agreement from last July - to keep native forest furnaces out of the renewable energy target.

"Tightening the definition of renewable energy to make sure that burning our native forests couldn't count towards building a Clean Energy Future is a critical part of the Multi-Party Climate Change Committee's agreement," Australian Greens Deputy Leader, Senator Christine Milne, said.

Following a report last week that the only market for Tasmanian woodchips is China, but that the Chinese market will only be accessible at rock-bottom prices, Forestry Tasmania needs to explain why it is seeking yet another failed, debt-ridden deal.

"Is it true that Forestry Tasmania is now in China offering woodchips from Tasmania's native forests at US $170 per tonne delivered?" Australian Greens Deputy Leader, Senator Christine Milne, asked.