|13 August, 2019

Land a critical resource to cut emissions: IPCC

Land is under pressure from humans and climate change, but it is part of the solution, says IPCC

A view of ice melting during a heatwave in Kangerlussuaq, Greenland is seen in this August 1, 2019 image obtained via social media. CASPAR HAARLOEV FROM "INTO THE ICE" DOCUMENTARY VIA REUTERS.

A view of ice melting during a heatwave in Kangerlussuaq, Greenland is seen in this August 1, 2019 image obtained via social media. CASPAR HAARLOEV FROM "INTO THE ICE" DOCUMENTARY VIA REUTERS.

Land is already under growing human pressure and climate change is adding to these pressures. Keeping global warming to well below 2C can be achieved only by reducing greenhouse gas emissions from all sectors including land and food, the IPCC said.

Land is already under growing human pressure and climate change is adding to these pressures. At the same time, keeping global warming to well below 2C can be achieved only by reducing greenhouse gas emissions from all sectors including land and food, the Intergovernmental Panel on Climate Change (IPCC) said in its latest report.

“Governments challenged the IPCC to take the first ever comprehensive look at the whole land-climate system. We did this through many contributions from experts and governments worldwide. This is the first time in IPCC report history that a majority of authors – 53 per cent – are from developing countries,” said Hoesung Lee, chair of the IPCC.

This report shows that better land management can contribute to tackling climate change, but is not the only solution. Reducing greenhouse gas emissions from all sectors is essential if global warming is to be kept to well below 2C, if not 1.5C.

In 2015, governments backed the Paris Agreement goal of strengthening the global response to climate change by holding the increase in the global average temperature to well below 2C above pre-industrial levels and to pursue efforts to limit the increase to 1.5C.

Land must remain productive to maintain food security as the population increases and the negative impacts of climate change on vegetation increase. This means there are limits to the contribution of land to addressing climate change, for instance through the cultivation of energy crops and afforestation. It also takes time for trees and soils to store carbon effectively.

Bioenergy needs to be carefully managed to avoid risks to food security, biodiversity and land degradation. Desirable outcomes will depend on locally appropriate policies and governance systems.

Climate Change and Land finds that the world is best placed to tackle climate change when there is an overall focus on sustainability. “Land plays an important role in the climate system,” said Jim Skea, Co-Chair of IPCC Working Group III.

“Agriculture, forestry and other types of land use account for 23 per cent of human greenhouse gas emissions. At the same time natural land processes absorb carbon dioxide equivalent to almost a third of carbon dioxide emissions from fossil fuels and industry,” he said.

The report shows how managing land resources sustainably can help address climate change, said Hans-Otto P?rtner, co-chair of IPCC Working Group II.

“Land already in use could feed the world in a changing climate and provide biomass for renewable energy, but early, far-reaching action across several areas is required. Also for the conservation and restoration of ecosystems and biodiversity,” he added.

Desertification and land degradation

When land is degraded, it becomes less productive, restricting what can be grown and reducing the soil’s ability to absorb carbon. This exacerbates climate change, while climate change in turn exacerbates land degradation in many different ways.

“The choices we make about sustainable land management can help reduce and in some cases reverse these adverse impacts,” said Kiyoto Tanabe, co-chair of the Task Force on National Greenhouse Gas Inventories.

“In a future with more intensive rainfall the risk of soil erosion on croplands increases, and sustainable land management is a way to protect communities from the detrimental impacts of this soil erosion and landslides. However there are limits to what can be done, so in other cases degradation might be irreversible,” he said.

Roughly 500 million people live in areas that experience desertification. Drylands and areas that experience desertification are also more vulnerable to climate change and extreme events including drought, heatwaves, and dust storms, with an increasing global population providing further pressure.

The report sets out options to tackle land degradation, and prevent or adapt to further climate change. It also examines potential impacts from different levels of global warming. “New knowledge shows an increase in risks from dryland water scarcity, fire damage, permafrost degradation and food system instability, even for global warming of around 1.5C,” said Valérie Masson-Delmotte, co-chair of IPCC Working Group I.

“Very high risks related to permafrost degradation and food system instability are identified at 2°C of global warming,” she said. – TradeArabia News Service

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