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“Recognizing Gerard's research at the Climate Impact Research Centre is a delightful development. Remarkably, Sweden has selected a researcher whose work is highly relevant to the Arctic as its representative. This is evidence of the exceptional research conducted by Umeå University's Arctic researchers,” comments Keith Larson, director of the Arctic Centre, the nomination.

This is the second consecutive year that the Frontiers Foundation nominates national finalists for the Frontiers Planet Prize. The announcement is on April 22, on "Earth Day," for a reason. The newly instituted prize is intended to stimulate high-level research that can contribute to concrete solutions for the challenges threatening the Earth's ecosystems. Out of the 23 finalists from various countries, three final winners will receive one million Swiss francs each (approximately 12 million SEK) for their ongoing research.

He is a uniquely talented scientist, with an ability to combine his deep understanding of freshwater ecosystems with exceptional computational skills.  For this paper, he was able to combine and analyze multiple global datasets to address an important question at a spatial scale that I would not have thought possible 20 years ago.

“I am really happy that Gerard is being recognized for this prestigious award. He is a uniquely talented scientist, with an ability to combine his deep understanding of freshwater ecosystems with exceptional computational skills.  For this paper, he was able to combine and analyze multiple global datasets to address an important question at a spatial scale that I would not have thought possible 20 years ago,” says Ryan Sponseller, Associate Professor at the department of Ecology and Environmental Science and main advisor for Gerard's postdoc.

In collaboration with researchers in the USA, the researchers at the Swedish University of Agriculture and Umeå University have mapped how the Earth's running water contributes to methane emissions in a study published in Nature in 2023. Freshwater systems account for half of the global emissions of the potent greenhouse gas methane, but it has long been unknown how significant the role of rivers and streams is in this cycle. With the help of thousands of observations, the researchers could show that rivers and streams emit methane at a similar rate to lakes globally. Particularly clear results were seen in the northern regions.

“We expected to find the highest emissions at the tropics, where it is warm, because the biological production of methane is highly sensitive to temperature. Instead, we found that emissions are also elevated in boreal and tundra biomes, despite low temperatures, likely because northern streams and rivers are often connected to peatlands and wetlands that are powerful methane sources,” explained Gerard Rocher-Ros when the study was published.

Where human activity is particularly significant, such as in canals, ditched streams, and rivers downstream of wastewater treatment plants, emissions tend to be higher. This insight motivates the many ongoing efforts in river restoration for the sake of biodiversity to continue since these measures may also have positive effects on emissions.

“In addition to improving freshwater quality and protecting the sensitive biosphere, restoration can also reduce the climate impact by lowering methane emissions," says Gerard Rocher-Ros.
 
The three final winners will be crowned at the Villars Symposium in Switzerland on June 26.