CLIMATE change may strip almost 10 per cent off the production of beef, sheep, wheat and dairy in Victoria by 2030.

And the availability of surface water in the southern Murray-Darling Basin will drop by 13 per cent.

They are among predictions in a new fact sheet released by the Department of Climate Change.

Estimates by the Australian Bureau of Agriculture and Resource Economics and Sciences forecast Victorian beef and dairy production to fall by 9.5 per cent each by 2030 unless the world took significant action on climate change.

Sheep production would contract by 8.5 per cent and wheat by 8 per cent, it tipped.

"While wheat producers may benefit from carbon dioxide fertilisation with modest levels of warming, yields are likely to decline under more extreme warming scenarios," the fact sheet said. "For example, in the region of Birchip, yields may drop by more than 20 per cent by 2100 in the absence of mitigation."

Water availability would also take a serious hit.

"In Melbourne, the average long-term stream flow into water-supply catchments could be reduced by up to 11 per cent by 2020, and as much as 35 per cent by 2050," the report said.