Tasmanian anti-logging activist Miranda Gibson is spending her second Christmas Day in her tree-top home.

Ms Gibson has been living on a platform in a eucalyptus tree, 60 metres above the forest floor in the Tyenna Valley in southern Tasmania, for more than a year.

She has been campaigning to protect high conservation-value forests from logging, and says she hopes it will be her last Christmas in the tree.

"I would really like to be coming down in 2013," she said.

"I think we have an opportunity to protect these forests, and particularly the Government has the opportunity with the nomination of these areas for world heritage and the deadline for that is the beginning of February."

Ms Gibson says she has sent a Christmas greeting to Environment Minister Tony Burke, urging him to add more Tasmanian forest to the World Heritage Area.

"It's really critical that these forests are protected through world heritage, through national parks and that includes those areas in the Tarkine that are now under threat from those mining leases," she said.