By Eric Akasa
The aim of achieving food security
across the globe will become increasingly elusive unless countries factor the
planet's nature-based services into agricultural and related planning, a report
released today from the UN Environment Programme (UNEP) says.
Safeguarding the underlying ecological foundations that support food
production, including biodiversity will be central if the world is to feed
seven billion inhabitants, climbing to over nine billion by 2050 argues the
study Avoiding Future Famines: Strengthening the Ecological Basis of Food
Security through Sustainable Food System.
Inefficiencies along the food delivery chain further complicate the challenge,
and the report highlights that an estimated one-third of food produced for
human consumption is lost or wasted, amounting to 1.3 billion tonnes per year.
The debate on food security so far has largely revolved around availability,
access, utilization and stability as the four pillars of food security, barely
touching on the resource base and ecosystem services that prop up the whole
food system.
The report aims to increase the focus on these crucial aspects, which are being
undermined by overfishing, unsustainable water use, environmentally degrading
agricultural practices and other human activities. It also frames the debate in
the context of the green economy, calling for food production and consumption
practices that ensure productivity without undermining ecosystem services.
“The environment has been more of an afterthought in the debate about food
security,” said UNEP Chief Scientist Joseph Alcamo. “This is the first time
that the scientific community has given us a complete picture of how the
ecological basis of the food system is not only shaky but being really
undermined.”
While pointing out the current challenges, the report also offers a clear way
forward to shore up the ecological foundations and improve food security. It
issues recommendations on the redesign of sustainable agriculture systems,
dietary changes and storage systems and new food standards to reduce waste.
“The era of seemingly ever-lasting production based upon maximizing inputs such
as fertilizers and pesticides, mining supplies of freshwater and fertile arable
land and advancements linked to mechanization are hitting their limits, if
indeed they have not already hit them,” said UN Under-Secretary General and
UNEP Executive Director Achim Steiner. “The world needs a green revolution but
with a capital G: one that better understands how food is actually grown and
produced in terms of the nature-based inputs provided by forests, freshwaters
and biodiversity.”
The report, produced in collaboration with other international organizations
including the International Fund for Agricultural Development (IFAD), the Food
and Agriculture Organization (FAO), the World Bank, the World Food Programme
(WFP) and the World Resources Institute (WRI), took a holistic approach to
analyzing the food system. Twelve scientists and experts authored the report,
covering many different areas of expertise including food consumption patterns,
agricultural production, marine fisheries and inland fisheries.
They found that while agriculture
provides 90 per cent of the world's total caloric intake, and world fisheries
provide the other 10 per cent, these life-supporting industries face many
threats, all of which are exacerbated by underlying driving forces such as
population growth, income growth and changing lifestyles/diets linked to
urbanization.
The report identified the following
specific threats to these systems:
Agriculture
Competition for water.
Some experts believe that future food demands need to be met by additional
irrigated land, but there is already strong competition from rapidly growing
domestic and industrial water withdrawals, Conventional agricultural
practices have a variety of ecosystem impacts, such as a reduction of
on-farm biodiversity and attendant increase in pests and disease, soil loss,
eutrophication and contamination of ground water, traditional agricultural
practices, if practiced inappropriately, can lead to severe land
degradation and Climate change and its impacts will compound the
preceding threats to agriculture by shifting crop-growing zones and bringing an
eventual decrease in crop productivity.
Marine Fisheries
Overfishing is the foremost force in undermining the ecological basis of
fisheries. The FAO estimated that as of 2008, 53 per cent of global marine
stocks are fully exploited, 15 per cent are either underexploited (3 per cent)
or moderately exploited (12 per cent), while 32 per cent are either
overexploited (28 per cent), depleted (3 per cent) or are recovering from
depletion (1 per cent),loss of coastal habitat such as coral reefs and
mangrove forests. At least 35 per cent of mangrove forests and 40 per cent of
coral reefs have been destroyed or degraded over the last decades, bottom
trawling, dredging and destructive fishing practices such as the use of
dynamite and cyanide, which lead to habitat loss or modification,
degradation of coastal water quality. Nutrient runoff causes coastal
eutrophication, zones of severely reduced dissolved oxygen and depleted aquatic
life. Over four hundred dead zones have been identified in coastal areas and climate
change will lead to warmer water and a more acidified ocean, with many
impacts on marine fisheries. The IPCC projects a global loss of 18 per cent of
the world's coral reefs in the next three decades, shrinking a crucial fish
habitat.
Inland Fisheries
Infrastructure developments
such as dam construction in river catchments are destroying or modifying inland
fishery habitats. More than 50 per cent of the world’s large rivers have been
fragmented by dams on their main channel and 59 per cent on their tributaries, land-use
change and removal of vegetation cover leads to increased runoff, erosion
and sediment pollution of water. Human activities have increased sediment flow
into rivers by about 20 per cent worldwide, agricultural expansion
disrupts connectivity between floodplains and rivers – floodplains provide some
of the most productive habitat for inland fisheries, agricultural runoff and
domestic and industrial wastewater discharges are degrading the quality of
many inland waters. Wastewater loadings to inland waters in Africa may increase
by a factor of four to eight between the 1990s and 2050.
Biodiversity
The variety and variability of animals, plants and micro-organisms at the
genetic, species and ecosystem levels are necessary to sustain key functions of
the ecosystem. For example, a diverse range of soil organisms interact with the
roots of plants and trees and ensures nutrient cycling.
Many food production activities negatively impact on this supporting
biodiversity, such as:
Fertilizer run-off, which causes
eutrophication, poses a threat to the diverse life of lakes and coastal areas,
excessive tillage – tilling to greater depths and more frequent cultivations –
has an increased negative impact on all soil organisms, in particular organisms
living in surface areas, such as earthworms ,deforestation and pesticide
contamination of lands adjacent to farmland degrade "off-farm
biodiversity", impacting pollinators and natural pest control of crops ,overfishing
may result in the removal of important components of the ecosystem, such as
algal-feeding fish in coral reef systems, with a consequence of altered
biodiversity and ecological states that may be impossible to restore ,aquaculture
activities are also a source of pollution and biodiversity concerns as they may
lead to the introduction of pathogens, strains and/or species that can alter
marine habitats and diversity ,the destructive fishing methods mentioned above
can disrupt marine ecosystems, and it may take hundreds of years for vulnerable
habitats such as cold water corals and seamounts to recover from such
practices.
While the problems are many and varied, the report issues a raft of
recommendations that can shore up the ecological foundations and create the
conditions for sustainable food production.
“The solutions are to be found along the whole food value chain - from the
farms that need to grow food more sustainability, through the large companies
that need to ensure that their products are from sustainable fisheries and
farms, up to the consumer who needs to think seriously about switching to a
sustainable diet and reduce food wastage,” said Prof. Alcamo.
“Of course, we have to deal first
and foremost with all the socio-economic issues having to do with food security
- questions of access and affordability of food, and so on,” he added. “But
ultimately we won't have enough food to distribute unless we find out a way to
produce it sustainably without destroying its ecological foundation.”
In summary, the scientists pointed
out that to neglect the ecological aspects of food security would hamper
efforts in its other four pillars. While we can’t avoid famine simply by making
the food system environmentally friendly, neither can we go on producing food
by wearing away its ecological foundation. In the end we’ll find – no
foundation, no food, says UNEP Chief Scientist.