Demographia

Etymologia:Ex hellen δήμος = "demos" ed "γραφειν" = "scribe", yani "(de)scribe id demos".
Definition: Demographia est un social science quos ziel est oistudye id population. 
 By Wikideas1 - Own work http://www.worldometers.info/world-population/population-by-country/, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=57342108
==Demographia est un social science==
Demographia eiskwt describe ed ghabe ia sulouks ed evolutions iom populations. Proto, est interesset meis besonters ab oik sulkweits bayna qua, khaliban, gnahratio, merto, nuptialitat, demographic crosct, id composition ye oumer au genos, au ia Migrations. Demographs orbate ye plur maschtabs : urb, land au tienxia. Demographia est unschi pregnohskwnd science chunke id gnohsa iom actual kweits ios population permitt tulges scenarios pro future. Pregnohskwen amet pre hol ia qualitative evolutions- kam id gerascen ios population, urbanisation au khayghiantro befolken ed ia previsible wans qua orient ex ta -, menxu biht anter tolken de demographic projections quando leit de ciffert vehrtens. Sei demographia, ithan definihn, est un nisbatan recent science, id interesse pro ia questions de population est lakin awo. Yant Antiquitat, historians au mussafers kam, ye id Vt secule pre JC, Thoukydides au Herodotos includent demographic considerations do ira scripts. 
Ab id XVIIt secule, plur autors pone ia methodologic suls os un statistique iom populations. Is Englisch Graunt (1620-1674), besonters, est ayt oino iom presten demographs ob pangus mertiostables per un statistic studye ios population os London. In France, Moheau (Recherches et considerations sur la population de la France, 1778) est bayna iens prestens quens demographia interesset per se ed ne ka un annex os philosophia au politic economia. Eyso samzaman, is Englisch economist ed demograph Malthus clar-ye punor panct id diemen inter demographic crosct ed economia (An Essay on the Principle of Population). Sekwent iom, id crosct ios population, ob id exceddt ia possibilitats os pieutproduction, est un surce os paupertat; is tetos concludt od tod croscto tehrpt bihe limitet. 
Unte dwoter dwidel ios XIXt secule, menxu Europe tyeict sien demographic transition, demographia biht genuin-ye un swobod ilm. Id antplehct sien wi concepts, sien deikers ed methods, besonters confrontend-ye sien resultats tibs altern social sciencen, sont-ya affirmend-se ka talga : sociologia, geographia au Historia. 
 Thomas Robert Malthus (1766-1834) buit un Englisch cleric ed professor, influent in ia camps om politic economia ed demographia. 
==Tienxia population ed Posdaril antslehnken==
Ia actual debats de posdaril antslehnken sont inseparable ex demographia. Ia responses bringhtu ibs problemes uns posdaril management iom ressurcen dependent meg sema mer-ye demographic questions : quayt mensci sient befolke Terra pos 50 au 100 yars ? Quer sient i wikes ? Qua tar sessient ir wans om piut, bog, Energia, beweiken, transport, etc ? I demographs, besonters ti ios Uniet Nations Organisation (UNO) tentent previde id evolution os tienxia population selegend-ye diversa scenarios, quom differences depende khaliban id meis au minter oku demographic transition sekwent ia continents. 
Med tod lexis est kyust id perigumt ex un tula inter alta gnahratio ed merto do un nov tula samt ghem ratios. Unte tod demographic transition, merto sehnct pre id gnahratio, seuwend uno natural crosct ios population. Tod model hat preter daughen ka describe id evolution ios europay population unte id XIXt secule ed preter dwidel ios XXt. Pon ia 1950tias, alter mund iklimes hant inkapt id sam transition. Inter id medium ed id end ios XXt secule, tienxia population hat yinjier doublet. Lakin, id transitionstopp est nun prev ed id croscttempo os tienxia population nilent. Id mutawassit projection previdt od tod solliet mikdare takriban-ye 9 milliards menscen circum 2050.
 Leuds in un strad os Peking. Kwekmor ios population ios Popules Respublic China est uno nisbatan-ye muzlim numer em yuwencs, quo est part-ye resultat ios "oinpurt siyassa". China hat meis quem 1,4 milliard weikern, id mierst numer tienxia, id milliard esus udmikdarn in 1982. Yeji id 2010 ardhem, 91,51 % sont khanrjiens, menxu 8,49% bayghe uno minoritat.
==Ia politic pands os demographia==
Ye id XVIt secule, Bodin (Les Six Livres de la République, 1576) declarit : "Ne est opnos ni force aun menscens". It eemehmeiht is ia politic pands os demographia, nu-ya meg diutos ia Stats eegeghiebeer. Ia awa Chinese, Misri, Roman au Inca imperia baygh aus kieur de organise ardhems de ir population. Pro el souverain, gnohe bilkull precis-ye id numer sienen subjects mieyn woide quayt wirs el ghohd mobilise do id lawo, quayt ghehdient al bringhes ia imposta el liv, etc. 
Nundiens, nov questions quommed ia Stats sont maimour yaschi dependent demographic considerations kam territorial planen, immigration au pensions. Gouvernements ed local wans naudhe woide kam siet id population evolve kay previde, mathalan, qua schowbeys sessient constructu, quer tehrpsient bihe construct, qua rewsa sessient dedien ei crosct iom agglomerations. Id longerascen os exspectet jumiung ed id gerascen ios population sont eminent-ye politic questions taghi phenomens rencause taiper id tula iom pensionsystemes, qua tehrbe yinjier bihe reformet kay remane kjiengow. 
Tod probleme concernt ne tik Europay lands, sontern yaschi China, eti meg acuter-ye ob leit de tienxia prest population. Senter land quod hat 113,5 millions leuden uper 65at (102,2 millions in Europe) solliet habe 331,3 millions tim in 2050.