The Australian Greens are alarmed the NSW Chief Scientist and Engineer has not recommended a moratorium on coal seam gas mining, despite acknowledging we don't have all the facts on health and environment impacts.

"We need to apply the precautionary principle when it comes to impacts on our land and water, especially in an age of food insecurity," Senator Larissa Waters, Australian Greens mining spokesperson, said.

"The National Water Commission has warned that potential impacts of coal seam gas on water are significant and uncertain.

The Australian Greens today announced a plan to stop the expansion of coal seam gas and coal mining at a Lock the Gate convergence near Tara in south west Queensland.

"Hundreds of people, including Ash Grunwald and Steady Eddy, have travelled far and wide to converge here in the Surat Basin against coal seam gas and coal today," Senator Larissa Waters, Australian Greens mining spokesperson, said at the gathering.

The Australian Greens have rebuked the Prime Minister for suggesting coal seam gas could help lower electricity prices in Australia.

"Extracting more gas won't reduce its price any more than digging up more gold reduces the gold price," said Australian Greens Leader Christine Milne.

"Kevin Rudd is confused by the basics on coal seam gas in Australia. Increased production will have zero impact on electricity prices because the industry is geared up to export it out of Queensland.

The Australian Greens have emerged as the only party concerned about protecting WA's water supplies from a future shale gas industry after the old parties today again turned down moves to impose Federal environmental regulations on shale and tight gas fracking.

"The Greens were the lone Party today voting in favour of modifying the Environment Protection and Biodiversity Conservation Amendment Bill 2013 to include protection of groundwater supplies from shale and tight gas extraction alongside protection from the coal seam gas industry," Senator Ludlam said

Larissa Waters spoke to journalists about the coal/CSG water trigger, and the Greens' attempts to improve it.

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The Australian Greens and NSW farmer Penny Blatchford are calling on the old parties to support the Greens' campaign to give landholders the right to say no to coal seam gas mining on their land.

Australian Greens Leader Senator Christine Milne said Tony Abbott, Warren Truss and Julia Gillard were refusing to stand up for landholders who don't want coal seam gas mining on their land.

Senator Christine Milne today announced the Australian Greens policy for no new coal seam gas and empowering land holders to say no to coal seam gas on their land.

"The Greens are the only party standing up to the big coal seam gas mining companies who are threatening our precious water, valuable farmland and global climate," Greens Leader Senator Milne said.

The influence of mining magnates, made clear in a public hearing at Parliament House today, cannot be allowed to sabotage a bill for federal protection for water resources from coal seam gas mining and large coal mines, say the Australian Greens.

“Mining bodies admitted during hearings today that they’ve been lobbying behind closed doors to water down this protection,” Senator Larissa Waters, Australian Greens mining spokesperson and a member of the Senate committee examining the bill, said.