Restoring converted lands key to combatting extinction, climate change
- Restoring a fraction of the world’s converted lands could save species, reverse warming
- Forests and wetlands deliver the highest climate and biodiversity benefits
- Cooperation among countries in each targeted region essential for ecosystem restoration
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[MANILA] Halting or reversing the effects of carbon dioxide and other planet-warming greenhouse gas emissions is best done by identifying key regions where action can be cost-effective, says a new study.
According to the study, published this month (October) in Nature, restoring a select 15 per cent of the world’s converted or degraded lands could avoid 60 per cent of expected extinctions while sequestering 299 gigatonnes of carbon dioxide or the equivalent of 30 per cent of the total carbon dioxide increase in the atmosphere since the Industrial Revolution.
Restoring 30 per cent of the world’s degraded lands to their natural state could rescue more than 70 per cent of land-based mammals, amphibians and birds under threat of dying out while soaking up more than 465 billion tons of carbon dioxide.
“Achieving restoration in practice requires cooperation among countries to share the costs of restoration”
Hawthorne Beyer, University of Queensland
Most of the priority areas identified are in developing countries and tropical regions, specifically South-East Asia, South Asia, Central and South America as well as West and Central Africa.
“This research is particularly useful for informing strategic decision-making at the level of international policy,” Hawthorne Beyer, a research fellow at University of Queensland in Australia and a co-author of the study tells SciDev.Net.
“However, achieving restoration in practice requires cooperation among countries to share the costs of restoration, and the development of national and regional programs that encourage land owners to participate in restoration activities and that compensate them for lost revenue — an idea known as 'payment for ecosystem services.’”
To help identify priority areas, the researchers analysed 2,870 million hectares of ecosystems worldwide that have been converted to farmland between 1992 and 2015. They then assessed the land based on three main motivators — reduction of extinction risk by increasing areas of habitats, sequestration of greenhouse gases and reduction of impact on agricultural production due to ecosystem restoration.
“Not every natural ecosystem will be optimal for climate and biodiversity, and even less areas are great for both benefits and not so much for agricultural production simultaneously,” Alvaro Iribarrem, a researcher and professor at the Pontifical Catholic University of Rio de Janeiro, Brazil and a co-author of the study, tells SciDev.Net.
Further complicating the challenge of identifying priority areas is that “restoration must not impact food production in the context of a growing global population over the coming decades”, says Beyer.
After factoring in the various costs and benefits the researchers found that restoring forests and wetlands delivers the highest climate and biodiversity benefits while restoring grasslands and arid ecosystems costs the least.
Ninety-six per cent of the Caribbean converted lands are in the top 15 per cent of global priorities for biodiversity. Restoring South American and African shrublands, meanwhile, brings important benefits for their unique biodiversity.
“Overall, coordinating restoration efforts across different types of ecosystems will yield the greatest overall benefits,” said Beyer in a handout to journalists.
“We have to anticipate insects and pathogens and people and policy,” he adds.
This piece was produced by SciDev.Net’s Asia & Pacific desk.