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According to the sources of the report of the United Nations (UN), Spain, with the lowest rate of fecundity in the world (1.07 children by woman in a fertile age), would have 30,226,000 inhabitants in 2050. That is less than the 39,628,000 it had in 2002, which had increased to 42,197,000 million in 2004 thanks to the increase of immigrants, which were more than 600,000 in 2003. In 2003, Spain took in one out of three people who immigrated to the European Union.

According to the division of population among the United Nations, the forecasts of population for the year 2050, comparing present population and the foreseeable one in 2050 by demographic zones, would be the following: Europe (present 727 million) anticipated for 2050, 603 million (-124 million); North America (present 314 million) anticipated for 2050, 438 (+124 million); South America (present 519 million) anticipated for 2050, 806 (+287 million); Africa (present 794 million) anticipated for the year 2050, 2 billion inhabitants (+1.206 million); Asia (present 3.7 billion) anticipated for the year 2005, 5.4 billion (+1.750 million).

The differences between the developed first world and the third world are evident, although these forecasts are exposed to many variations in such a big gap. For Spain, the population variations are of 39,600,000 inhabitants in 2000; 36,600,000 in 2025; and 30,200,000 in 2050. Spain, according to these forecasts, would need 12 million immigrants by 2050.

The variations of population between Europe and Africa are remarkable: after World War II, Europe represented 22% of the world-wide population and Africa only 8%. Now the two zones have the same proportion of 13%. Nevertheless, by the year 2050, Africa will be three times more populated than Europe. With reference to Spain, these data are significant: 50 years ago, Spain had a population three times bigger than Morocco; whereas within half a century, Morocco will have 60% more inhabitants than Spain.

Why be surprised then that half of the Arab adolescents wish to immigrate and leave their countries? Of the 2.8 billion inhabitants of the 22 African-Arab countries, 38% of the members of that population are less than 14-years-old. Morocco at the moment has about 30.5 million inhabitants, where 19% of the people are below the poverty threshold, occupying 123 rd position (of 173) in an Index of Human Development (Spain has 21 st ). Fifty percent are illiterate. The percentage of unemployment among Moroccans between the ages of 15 and 34 is that of 50%, and every year Morocco need to employ 250,000 new young people. The birth-rate is 3.05 children per woman, while Spain’s is 1.05 children per woman. There are 3 million Moroccans living away from their country; 300,000 of these immigrants are in Spain. Moroccans form the most numerous national group of foreigners in Spain, followed by the Latin Americans, who are driven to immigrate by the same structural factors previously mentioned: a globalized international market in capital, resources, and work; an unjust division between the North and South; a world-wide demographic imbalance and countries of origin with serious problems of poverty, political corruption, or citizen insecurity.

Questions & Answers

anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Immigration in the united states and spain: consideration for educational leaders. OpenStax CNX. Dec 20, 2009 Download for free at http://cnx.org/content/col11150/1.1
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