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As cities are grow, dietary are different. Most
of people who live in urban area are very demanding of diversity dietary,
including types of vegetables, fruits and meat, this type of foods are
increasingly consuming processed foods. These supply chain movements are
getting change and affecting all farmers from small to medium enterprises, and
consumers. A procedure has started, , which will continue for decades, that is
transforming the food systems from farm to fork.(Säumel
et al., 2012)


The major mission of urban agriculture based on
the author article is to feed the urban populations necessarily hinges on
estimations of how much food can be grown within a city area. The cities are
exploding by human growth in this worlds. Today, the more people are living in
urban areas than rural areas. More than 66 percent of the world’s people are
expected to live in cities by 2050, they very demanding for food for living
purposes. Especially in low- and middle-income countries like Asia, Africa, and
Latin America, to feeding urban populations has become an important and crucial
challenge. Despite their populations density, cities do have more potential for
food growing in that area.

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Farming in the cities


There are other benefits to building integrated
agriculture. Placing greenery on otherwise hard rooftops, for instance, can
alleviate urban heat island effect (Yu, et al., 2008; Chen, et al., 2005).
Bringing production closer to consumption can reduce food miles, i.e. the
distance food travels in getting to the consumer’s plate (Severson, 2006),
which decreases carbon emissions due to transport. Land outside cities need not
be set aside for intensive commercial farming, which of itself has many
health-related, social and environmental consequences.


-Urban agriculture can be defined as co-locating
crop cultivation within the city boundaries and this is one of potential
strategy to those issues. By integrating of food production in and on the
buildings offers an avenue that does not impinge on the city`s many make uses
for available land


-on author article stated that there are several
crucial issues on that paper article will be several highlighted. First in
depth of conventional commercial farming techniques have brought on
irreversible damage to the land (Hillel, 1991); millions of hectares of
grasslands, wetlands and forest were degraded and the cost of affection most of
ecosystems have been damaged with significant loss of biodiversity (Wilson,
1992). The clearing of land for farming activities also effects of long-term
period carbon sequestration by other permanent wood plantations (Wiliams,
2003). Second, as the world population increases from the present 6.4 billion
to 8 billion by 2025 (salim, 2004), there`ll no longer be enough arable
farmland (United States Census Bureau, 2003). This raises the spectre of food
crises. The situation is aggravated by rampant urbanization because of more
land, previously used for agriculture, set aside to cope with growing cities.
The prediction that the proportion of the world’s population that lives in the
cities will increase from 47 percent in 2000 to 60 per cent by 2030 (United
Nations, 2001)


-A few developing countries in this world, they
are already concern about environmental issues especially in Hong Kong, the
promotion of sustainable environment especially on green roof have attracted a
lot of attention in recent years (Hui, 2009; Urbis Limited, 2007). They already
believed that green roofs can help mitigate the unfavourable outcomes of UHI in
the city and bring the nature back to the urban area. They not only can help to
lower the urban temperatures, but enhance aesthetics and urban psychology, as
well as lessen pollutant concentrations and noise (Hui, 2006)


-Nowadays, many cities especially in urban area
are dealing with problems of urban heat island (UHI) and lack of greenery
space. Some cities are seeking to improve sustainability by enhancing urban
greenery and promoting urban agriculture or farming (Mougeot, 2006; Smit Ratta
and (Nasr, 1996). By preparing a few technologies by installing green roof with
urban farming, its far feasible to obtain environmental, social and economic
sustainability for residents especially in urban cities due to fact it is able
to contribute to mitigation of environmental problems, enhancement of community
function and improve of city food systems (Bay Localize, 2007; Canadian CED
Network, 2007; Kisner, 2008; Kortright, 2001; Lim and Kishnani, 2010).

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