Environmental groups outside the forestry peace deal are attacking the credibility of the Wilderness Society.
Fringe groups are angry about the society's comments during an Upper House inquiry into the peace deal legislation.
The society's Vica Bayley revealed he will travel overseas, asking customers of a timber veneer company to be patient while an end to the forest wars is being finalised.
He plans to meet customers of Ta Ann in Japan.
That has prompted Jenny Weber from the Huon Valley Environment centre to question whether the society cares about protecting the forests or supporting Ta Ann.
Ms Weber says scores of people have left the society because they are disappointed the group is lobbying for the industry.
But Mr Bayley says the deal is the best way forward for conservation.
A former Forestry Tasmania employee has lashed out at the actions of environmental signatories to the peace deal.
Simon Grove has urged MPs to reject the legislation, claiming environmental groups shouldn't be "rewarded" for "bad behaviour".
"I see that their tactics have been about bullying and about getting people to negotiate under duress," he said.
Biologist Susan Baker is highly critical of the process used to identify half a million hectares of new native forest reserves.
"That it's not based on the areas that are necessarily of highest value for conservation biodiversity."
Signatories to Tasmania's forest peace deal remain split over proposed amendments.
Almost 160 pages of amendments flagged 295 forest areas for protection on the eve of an Upper House inquiry into the issue.
But Mr Bayley told the inquiry there is no issue with attaching the defined protection areas to the legislation.
"Rolling the protection order into the legislation, in my view, tries to address the challenge of the two-three month delay or hiatus period while this committee undertakes its business," he said.
"In terms of a durability report for example I don't see a massive issue, I accept that Terry does."
Activist Miranda Gibson says she is not happy with the level of protection for the forest where she has been tree-sitting for more than a year.
"I'll stay up here till the forests are protected," she said.
Several Upper House MPs have defended their absence from the peace deal inquiry.
Western Tiers MLC, Greg Hall, says he has had long standing medical appointments which he could not reschedule.
Launceston MLC, Rosemary Armitage, says she has had work commitments in the state's north.
Apsley MLC Tania Rattray has been contacted for comment.