The Tasmanian government has hired consultants to audit its greenhouse gas emissions.

International consultancy Parsons Brinckerhoff will begin reviewing energy consumption in government departments and ministers' office this week, as well as emissions from car and air travel and core government administrative areas, including Parliament.

They are expected to develop emission reduction targets for every government department.

PB will also conduct energy audits on key government buildings and recommend ways to reduce their energy use, and prepare a program for installing solar hot water systems and electricity-generating solar systems in government-owned buildings.

The consultants' final report is due in mid August.

Premier Paul Lennon said the audit showed Tasmania was leading the way on climate change.

"While other state governments have audited some of their operations, Tasmania will be the first state to embark on a whole-of government audit of emissions," he said.

"Climate change requires urgent action, so we are acting now."

The premier said Tasmania would introduce legislation in the budget session of Parliament committing the state to a 60 percent reduction in greenhouse gas emissions, based on 1990 levels, by 2050.