The Australian capital Canberra produces the majority of its most common food in its regional hinterland, while Tokyo primarily ensures its food security through import.
John R. Porter is also the main lead author of the forthcoming report from the IPCC Working Group 2 on food production systems and food security, which will be released following governments’ review, in March 2014.
Higher farmland yields have influenced the cities self-provisioning over the past 40 years, but overall the ability of cities to feed themselves is unlikely to keep pace with increasing population, the research shows.
Self-provisioning does not increase in line with population growth
Particularly in the capitals of Australia and Japan, where the population has increased tremendously over the past 40 years, the self-provision has declined; in Canberra from 150 to 90 percent and in Tokyo from 41 to 27 percent.
This is despite the increase in yield of agricultural land per hectare. Copenhagen on the other hand, has increased its self-provision slightly from 34 to 45 percent because its population has remained fairly constant.
“When the local capacity to supply a city declines, it becomes more dependent on the global market. As an example, Japan imported wheat from 600,000 hectares of foreign farmland to meet the demand of their capital and surrounding region in 2005. This means that large cities should now start to invest in urban agriculture especially if climate change has large effects on food production and other parts of the food chain in the future,” says John R Porter.
The study has exclusively focused on the historical and current production and not considered whether changes in land management practices can increase productivity further or whether consumers are willing to limit their intake to local seasonally available goods. It did not include citizen-based production from allotments, urban gardens etc.
Scientific debate on food security and urbanisation
More than half the human population lives in or near cities. That has increased global food transportation which makes up 15 percent of the global greenhouse gas emissions.
Both food security and urbanisation is on the programme for next year’s major international conference on sustainability hosted by the IARU partnership. John Porter is organising the session on global challenges and sustainable solutions related to food security.
“The congress will be an important event to discuss new insight in global food security and the different challenges faced by rural and urban populations. Also, we get a unique chance to stimulate the discussion with input from expertise of other disciplines, such as economy, biodiversity and health”.
The congress is hosted locally by the University of Copenhagen and takes place in October 2014. Registration is open with an early bird discount until 31 March 2014. Submission of scientific contributions opens 1 January 2014 and will stay open for three months.
More information on http://sustainability.ku.dk/iarucongress2014/
John Porter | EurekAlert!
New study: How does Europe become a leading player for software and IT services?
03.04.2017 | Fraunhofer-Institut für System- und Innovationsforschung (ISI)
Reusable carbon nanotubes could be the water filter of the future, says RIT study
30.03.2017 | Rochester Institute of Technology
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
24.05.2017 | Event News
23.05.2017 | Event News
22.05.2017 | Event News
26.05.2017 | Life Sciences
26.05.2017 | Life Sciences
26.05.2017 | Physics and Astronomy