Why a top climate scientist may stop contributing to future UN assessment reports

Zurich-based scientist Sonia Seneviratne, an expert on extreme weather, spent hundreds of hours volunteering her time as alead author for a chapter in the UN climate panel's latestassessment of global warming.

Seneviratnehas contributed to threeof the six assessment reports that have been published since 1990bythe Intergovernmental Panel on Climate Change (IPCC). These documentsoffer a detailed look at how climate change is altering the world. Themost recent report, for example, drew on more than 14,000 scientific studies and was published this week.

But it could be her last time contributing to these reports. She questions theirusefulness and has becomefrustrated that policy-makers continue to fail to act on the scientific research.

"You can ask: Is it a meaningful use of scientists' time if nothing is being done," she told Reuters, the day the report was released.

In a follow up interview with CBC News, Seneviratneclarified that she washappy to have contributed to the international report and that it does provide a robust assessment of the current state of climate change.

'No point for us to just observe'

"I think what I wanted to communicate is, yes, there is some level of frustration," she told CBC News."There is no point for us to just observe what a disasteris unfolding if nobody is doing anything about it."

Among the warnings, the report predicted the world will cross the 1.5 Cwarming mark in the 2030s, earlier than some past predictions.

Italso found that weather extremes once considered rare or unprecedented are becoming more common a trend that will continue even if the world limits global warming to 1.5 C, as the Paris climate deal aims to do.

Even if emissions are slashed in the next decade, average global temperatures could rise by1.5 C by 2040 and possibly 1.6 C by 2060 before stabilising, the report found.

Seneviratnealong withXuebin Zhang, a senior research scientist with Environment and Climate Change Canada, were the co-ordinating lead authors of the report's chapter on extreme weather.

She said she is notexcluding the idea of contributing to some smaller,more targeted IPCC reports. But shesaid,"if there is norealaction happening as a follow up to [the sixth assessment]report, you can question whether this is effective."

"There is a need for monitoring and looking at what is happening. It's actually the policy-makers that are asking scientists to make those reports;I would say the scientists have done their job and now policy-makers have to do their own job."

IPCC report co-author Baylor Fox-Kemper, professor of Earth, Environmental and Planetary Sciences at Brown University in Rhode Island, echoed Seneviratne's remarks. One of the reasons scientistsprepare the report is to provide decision makers with information that may stimulate mitigation efforts, he said.

'Less than I hoped'

"Andin that respect I'm with Dr. Seneviratnethat the response to our reports has been less than I hoped," Fox-Kempersaid in an email to CBC News.

However, he said, without themost up-to-date information and projections on thechanges to come, it is difficult to create aneffective adaptation strategy or infrastructure.

"For that reason, our work is valuable," he said. "While we may be underwhelmed by the response, if we stop it is surely likely to diminish action."

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Robert Kopp, director of theInstitute of Earth, Ocean, and Atmospheric Sciences at Rutgers University, who also co-authored the report, agreed thatIPCC assessmentreports are a major volunteer effort.

"It's not surprising to me that Sonia or, frankly, any of the other folks who contributed to the most time-intensive roles, that of coordinating lead author chose not to do it again," he said.

Need for more detailed information

Still, there's a need fordetailed information about how to mitigate, as well as how to adapt to, the climate risks that we've created, Kopp said.

"So I don't think the IPCC assessment reports are becoming futile, but I do think it's very reasonable to ask whether the current structure of the IPCC assessment report divided up into separate reports on physical science, impacts/adaptation, and mitigation is the most effective one."

Darrell Kauffman, professor at Northern Arizona University's School of Earth & Sustainability, said he agreedthat policymakers have more than enough information on which to act; but he still sees "tremendous value" in generating future reports.

"The science behind climate change is growing rapidly and decisions should be based on the most current and well-understood science," he said in an email to CBC News.

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IPCC reports also create healthy feedback forthe scientificcommunitytotake stock of progress.They also provide some measure of standardization forscientific approaches and terminology, he said.

As well, they bring together expertise from across the climate science community "to generate synergistic outcomes that are rare in academia and governmental science."

"Needless to say," he said, "I'm a big fan."