Greens Leader Richard Di Natale visited a local medical centre with rooftop solar today, on the campaign trail with Greens candidate for Canning Dr Vanessa Rauland.

"People here have a choice: you can stick with the past and vote for Tony Abbott, or you can choose a clean, renewable, jobs-rich, pollution-free future. That's what the Greens are putting forward to the people of Canning," said Senator Di Natale.

Nick McKim has been sworn in this morning as the Australian Greens' new Senator for Tasmania, replacing former leader Christine Milne.

"I'm honoured and excited to have been sworn in today as the Greens' new Senator for Tasmania," said Senator McKim.

"I become a Senator at a tough time for our country, with a dysfunctional government that is governing for itself and not for the Australian people, but a really exciting time for the Greens.

The Australian Greens are pleased to announce that former Tasmanian Greens Leader Nick McKim has been elected by a ballot of members to become the next Greens Senator for Tasmania. Mr McKim will fill a casual vacancy in the Senate, created by the resignation of Christine Milne.

“I want to thank the Tasmanian Greens members for giving me this honour and I will do everything I can to repay the faith they have put in me,” McKim said. “Replacing someone of Christine’s calibre will be a huge challenge, but one that I’m really looking forward to.”

Greens Leader Richard Di Natale expressed grave concerns today about the Abbott government's moves to revoke Australian citizenship.

"Australians can't afford a captain's call from Tony Abbott on citizenship. There has to be a debate about this," said Senator Di Natale.

"A strong leader understands that the job of the government is to protect the community, not threaten and frighten people.

"Tony Abbott must listen to more sensible voices within his Cabinet and recognise his approach frightens the community and does not make us safer.