The 2015 Budget has no vision for the future of South Australia, say SA's Australian Greens Senators.

Senator Penny Wright said the Government was continuing to protect big business at the expense of everyday South Australians.

"The Abbott Government has absolutely no vision for South Australia's future. Rather than finding new sources of revenue from the big end of town, this Budget cuts one vital service to fund another," Senator Wright said.

The new climate agreements signed by the Adelaide City Council and State Governments have left the Abbott Government marooned, says Australian Greens Senator for SA Penny Wright.

"The Abbott Government's determination to destroy the renewable energy target is an international embarrassment and risks local jobs here in SA," Senator Wright said.

New figures show China imported 42 per cent less coal in the first quarter of 2015 compared with the same period last year, with analysts saying it's a signal demand for Australian coal will continue to fall.

"We need to leave it in the ground, simple as that," said Australian Greens Leader Christine Milne.

"Tony Abbott has got to stop propping up this polluting industry that is falling down around his ears.

Australian Greens Leader Christine Milne has thrown her support behind the Tasmanian Government’s investigation of a new data cable for the state and called on the federal government to help out if needed.

“This is one of those cases of ‘if you build it they will come’,” Senator Milne said.

“A fourth data cable connecting us to the world could bring costs down and attract more ICT business to the state.

Australian Greens Leader Christine Milne says the government's Energy White Paper needs to be binned along with the Warburton review into the RET, as both have been written to protect the profits of the Coalition's mates in the fossil fuel sector.

"This Energy White Paper is nothing more than a pamphlet by the wholly-owned subsidiary of the coal industry that is the Abbott government," said Senator Milne.

The Australian Greens have called for an increased commitment to renewable energy from all levels of government in light of Alinta Energy's determination that a solar thermal plant in Port Augusta remains unfeasible at this stage.

Australian Greens Senator for South Australia Senator Penny Wright said South Australians overwhelmingly wanted renewable energy to replace dirty coal power.

"The future is renewable - there is no doubt about that," Senator Wright said. "It's time for all governments to step up and take the leader to make solar thermal happen at Port Augusta."

Greens Leader Christine Milne says it's no surprise that Australian officials have been instructed to try to protect fossil fuel subsidies at the OECD.

"The Abbott government is a wholly owned subsidiary of the coal industry. There's no other way of looking at it," said Senator Milne.

"Anyone who was unsure if the government's attack on the Renewable Energy Target was anything other than attempt to prop up coal would now be in no doubt.

Greens Leader Christine Milne says now is no time to settle on a lower Renewable Energy Target, which would lock in lower investment, fewer jobs, and a smaller cut to carbon pollution.

"If the government wants to fix uncertainty in the renewable energy industry, they can do it today. All it takes is for Mr Abbott to back off his cut to the RET, the way he's backed down on Medicare and university fees," said Senator Milne.

Australian Greens Leader Christine Milne says the government's global warming denial is on full display today, as new figures show pollution has increased since the repeal of the carbon price.

"The depth of this government's denial is alarming. They're condemning Australia to economic dislocation, to being way behind the rest of the word, and to making life harder and more dangerous for everyone in our region, as extreme fires and storms intensify," said Senator Milne.

The Greens are calling on Labor to reject the Abbott government's ‘offer' to cut the Renewable Energy Target.

"This is just like the government's cuts to Medicare and universities. Attacking clean energy is bad policy that will cost Australians, immediately and for generations to come," said Greens Leader Christine Milne.

"Labor must not shake on a bad deal that will destroy renewable energy, destroy jobs, drive power bills up, and keep Australia reliant on dirty power.