Many countries, including Canada, are counting on some kind of underground carbon storage to keep planet-warming greenhouse gases out of the atmosphere and avoid the most catastrophic climate projections.

But a study published this week in the journal Nature is raising a new issue with what is already a mostly unproven technology.

The study, led by researchers in the U.K., Austria and the U.S., analyzed a wider range of risk factors than conventional assessments of carbon storage potential.

They found that globally, about 1,460 billion tonnes of carbon dioxide can be safely stored underground. That's significantly less than current projections of around 12,000 billion tonnes. That means using all the safe areas for carbon storage would cut global warming by only 0.7 C, much les

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