Weekend Herald

UN: Biodiversi­ty must be part of climate-change battle


To save the planet, the world needs to tackle the crises of climate change and species loss together, taking measures that fix both and not just one, United Nations scientists said.

A joint report yesterday by separate US scientific bodies that look at climate change and biodiversi­ty loss found there were ways to simultaneo­usly attack the two global problems, but some fixes to warming could accelerate extinction­s of plants and animals.

For example, measures such as expansion of bioenergy crops like corn, or efforts to pull carbon dioxide from the air and bury it, could use so much land — twice the size of India — that the impact would be “fairly catastroph­ic on biodiversi­ty”, said co-author and biologist Almut Arneth at the Karlsruhe Institute of Technology in Germany.

Policy responses to climate change and biodiversi­ty loss had long been siloed, with different government agencies responsibl­e for each, said co-author Pamela McElwee, a human ecologist at Rutgers University.

The problems worsen each other, are intertwine­d and in the end hurt people, scientists said.

“Climate change and biodiversi­ty loss are threatenin­g human wellbeing as well as society,” said report co-chair Hans-Otto Portner, a German biologist who helps oversee the impacts group of the UN’s Intergover­nmental Panel on Climate Change.

Earth’s naturally changing climate shaped what life developed, including humans, but once people in the industrial­ised world started pumping fossil fuels into the air, that triggered cascading problems, Portner said.

“It’s a high time to fix what we got wrong. The climate system is off-track and the biodiversi­ty is suffering.”

There are many measures that can address both problems at once, the report says.

“Protecting and restoring highcarbon ecosystems,” such as tropical forests and peatlands, should be high priority, said co-author Pete Smith, a plant and soil scientist at the University of Aberdeen.

“This report is an important milestone,” said Simon Lewis, chairman of global-change science at University College London, who was not part of the report.

“Finally the world’s bodies that synthesise scientific informatio­n on two of the most profound 21st century crises are working together,” he said.

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