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Further research

To learn more about population concerns, from the new-era ZPG advocates to the United Nations reports, check out these links: (External Link) and (External Link)

References

Caldwell, John Charles and Bruce Caldwell. 2006. Demographic Transition Theory. The Netherlands: Springer.

CIA World Factbook. 2014. "Guide to Country Comparisons." Central Intelligence Agency World Factbook . Retrieved October 31, 2014 (https://www.cia.gov/library/publications/the-world-factbook/rankorder/rankorderguide.html).

Colborn, Theo, Carol Kwiatkowski, Kim Schultz, and Mary Bachran. 2011. "Natural Gas Operations from a Public Health Perspective." Human&Ecological Risk Assessment . 17 (5): 1039-1056

Connor, Phillip, D'Vera Cohn, and Ana Gonzalez-Barrera. 2013. "Changing Patterns of Global Migration and Remittances." Pew Research Centers Social Demographic Trends Project RSS. N.p., Retreived October 31, 2014 (http://www.pewsocialtrends.org/2013/12/17/changing-patterns-of-global-migration-and-remittances/).

Dart, Tom. 2014. "Child Migrants at Texas Border: An Immigration Crisis That's Hardly New." The Guardian [Houston]. www.theguardian.com. Guardian News and Media Limited. Retrieved October 30, 2014 (http://www.theguardian.com/world/2014/jul/09/us-immigration-undocumented-children-texas).

Ehrlich, Paul R. 1968. The Population Bomb . New York: Ballantine.

Environmental Protection Agency. 2014. "EPA's Study of Hydraulic Fracturing and Its Potential Impact on Drinking Water Resources." U.S. EPA, September 14. Retrieved October 29, 2014. (http://www2.epa.gov/hfstudy).

Fox News, and Associated Press. 2014. "Protests Turn Back Buses Carrying Illegal Immigrant Children." Fox News. FOX News Network. Retrieved October 30, 2014 (http://www.foxnews.com/us/2014/07/02/protests-force-buses-carrying-illegal-immigrant-children-to-be-rerouted/).

Henry, Terrence. 2012. "How Fracking Disposal Wells Are Causing Earthquakes in Dallas-Fort Worth." Texas RSS. N.p., August 6. Retreived October 29, 2014 ( (External Link) ).

IHS Global Insights. 2012. "The Economic and Employment Contributions of Unconventional Gas Development in State Economies." Prepared for America's Natural Gas Alliance , June 2012. Retrieved October 29, 2014. ( (External Link) ).

Malthus, Thomas R. 1965 [1798]. An Essay on Population . New York: Augustus Kelley.

Passel, Jeffrey, D'Vera Cohn, and Ana Gonzalez-Barrera. 2013. "Population Decline of Unauthorized Immigrants Stalls, May Have Reversed." Pew Research Centers Hispanic Trends Project RSS. N.p., Retreieved October 31, 2014 (http://www.pewhispanic.org/2013/09/23/population-decline-of-unauthorized-immigrants-stalls-may-have-reversed/).

Pew Research Center. 2013. "Immigration: Key Data Points from Pew Research." Pew Research Center RSS. N.p., Retrieved October 31, 2014 (http://www.pewresearch.org/key-data-points/immigration-tip-sheet-on-u-s-public-opinion/).

Popescu, Roxana. 2014. "Frequently Asked Questions about the Migrant Crisis." U-T San Diego. San Diego Union-Tribue, Retreieved October 31, 2014 (http://www.utsandiego.com/news/2014/jul/22/Migrant-crisis-FAQ/).

Reyes, Raul A. 2014. "Murrieta Immigration Protests Were Unfortunate, Unnecessary." The Huffington Post . TheHuffingtonPost.com, Retrieved October 31, 2014 (http://www.huffingtonpost.com/raul-a-reyes/murrieta-immigration-prot_b_5569351.html).

Simon, Julian Lincoln. 1981. The Ultimate Resource . Princeton, NJ: Princeton University Press.

The United Nations Refugee Agency. 2014. "World Refugee Day: Global Forced Displacement Tops 50 Million for First Time in Post-World War II Era." UNHCR News. N.p., Retrieved October 31, 2014(http://www.unhcr.org/53a155bc6.html).

U.S. Congress. 2008. The William Wilberforce Trafficking Victims Protection Reauthorization Act of 2008. 7311, 110 Cong., U.S. G.P.O. (enacted). Print.

Questions & Answers

how does the planets on our solar system orbit
cheten Reply
how many Messier objects are there in space
satish Reply
did you g8ve certificate
Richard Reply
what are astronomy
Issan Reply
Astronomy (from Ancient Greek ἀστρονομία (astronomía) 'science that studies the laws of the stars') is a natural science that studies celestial objects and phenomena. It uses mathematics, physics, and chemistry in order to explain their origin and evolution.
Rafael
vjuvu
Elgoog
what is big bang theory?
Rosemary
what type of activity astronomer do?
Rosemary
No
Richard
the big bang theory is a theory which states that all matter was compressed together in one place the matter got so unstable it exploded releasing All its contents in the form of hydrogen
Roaul
I want to be an astronomer. That's my dream
Astrit
Who named the the whole galaxy?
Shola Reply
solar Univers
GPOWER
what is space
Richard
what is the dark matter
Richard
what are the factors upon which the atmosphere is stratified
Nicholas Reply
is the big bang the sun
Folakemi Reply
no
Sokak
bigbang is the beginning of the universe
Sokak
but thats just a theory
Sokak
nothing will happen, don't worry brother.
Vansh
what does comet means
GANGAIN Reply
these are Rocky substances between mars and jupiter
GANGAIN
Comets are cosmic snowballs of frozen gases , rock and dust that orbit the sun. They are mostly found between the orbits of Venus and Mercury.
Aarya
hllo
John
hi
John
qt rrt
John
r u there
John
hey can anyone guide me abt international astronomy olympiad
sahil
how can we learn right and true ?
Govinda Reply
why the moon is always appear in an elliptical shape
Gatjuol Reply
Because when astroid hit the Earth then a piece of elliptical shape of the earth was separated which is now called moon.
Hemen
what's see level?
lidiya Reply
Did you mean eye sight or sea level
Minal
oh sorry it's sea level
lidiya
according to the theory of astronomers why the moon is always appear in an elliptical orbit?
Gatjuol
hi !!! I am new in astronomy.... I have so many questions in mind .... all of scientists of the word they just give opinion only. but they never think true or false ... i respect all of them... I believes whole universe depending on true ...থিউরি
Govinda
hello
Jackson
hi
Elyana
we're all stars and galaxies a part of sun. how can science prove thx with respect old ancient times picture or books..or anything with respect to present time .but we r a part of that universe
w astronomy and cosmology!
Michele
another theory of universe except big ban
Albash Reply
how was universe born
Asmit Reply
there many theory to born universe but what is the reality of big bang theory to born universe
Asmit
what is the exact value of π?
Nagalakshmi
by big bang
universal
there are many theories regarding this it's on you believe any theory that you think is true ex. eternal inflation theory, oscillation model theory, multiple universe theory the big bang theory etc.
Aarya
I think after Big Bang!
Michele
from where on earth could u observe all the stars during the during the course of an year
Karuna Reply
I think it couldn't possible on earth
Nagalakshmi
in this time i don't Know
Michele
is that so. the question was in the end of this chapter
Karuna
in theory, you could see them all from the equator (though over the course of a year, not at pne time). stars are measured in "declination", which is how far N or S of the equator (90* to -90*). Polaris is the North star, and is ALMOST 90* (+89*). So it would just barely creep over the horizon.
Christopher
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Source:  OpenStax, Introduction to sociology 2e. OpenStax CNX. Jan 20, 2016 Download for free at http://legacy.cnx.org/content/col11762/1.6
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