A Saskatchewan farm couple says greenhouse gases that were supposed to be stored permanently underground are leaking out, killing animals and sending groundwater foaming to the surface like shaken-up soda pop.

Cameron and Jane Kerr, who own land above the Weyburn oilfield in eastern Saskatchewan, have released a consultant's report that claims to link high concentrations of carbon dioxide in their soil to gas injected underground every day.

Energy giant Cenovus injects eight-thousand tonnes of the gas every day in an attempt to enhance oil recovery and fight climate change.

Cameron Kerr says ponds on his land have developed algae blooms, clots of foam and scum, while small animals have been found dead a few metres away.

A consultant found high concentrations of carbon dioxide in the soil that matches the carbon dioxide Cenovus has been injecting.

The Saskatchewan NDP government had agreed to conduct a year-long study to find out what was going on, but that hasn't happened since the government changed in 2007.

The suggestion that the Weyburn capture and storage project might be leaking could have implications for similar projects that try to store carbon underground, a technique being studied around the world with billions of dollars of public financing.