O Planeta Terra como sistema
Autor: Russô (José Roosevelt Dias) | Publicado: 2014-06-04T19:15:00-07:00

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O Planeta Terra como um Sistema



Muito se tem falado de sistema ecológico numa visão de
integração e de auto dependência. Uma ideia central está no fato de haver
predadores e presas; parece que todo animal é visado por outros de uma ou mais
espécies ditas predadoras. Algumas espécies, no entanto, estariam numa posição
denominada topo da cadeia alimentar. Um
exemplo é o leão; outros são o tubarão e a baleia Orca. 

No entanto, o sistema ecológico é
algo mais amplo; envolve gases, rochas, minerais vegetais e animais. Afinal, a
cosmologia aceita ainda hoje é a que coloca o inicio do universo como fruto de
uma explosão. No deslocamento durante a expansão ocorreu resfriamento e a
possibilidade de vida. 

Assim a integração mais apurada e que
integra todo um ambiente é o que envolve questões de temperatura, gases e
ambiente para geração e manutenção da vida. Sabemos que a vida teve seu inicio
num ambiente gasoso e caótico até atingir um ponto de estabilidade (onde apenas
pequenas oscilações ocorrem).

O planeta Terra seria um sistema de
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<![endif]--><!--[if gte mso 10]>

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<![endif]-->&nbsp;Esta consideração é denominada&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Gaia A Terra Viva e apresenta a Terra
como um sistema autorregulado. Isto será descrito mais adiante.A manutenção de uma temperatura capaz de manter um ser vivo
existir é uma das ações deste sistema. 

Os seres vivos são desenvolvimentos
de sistema autorregulados e se podem agir modificando o meio ambiente, está clara
a sua dependência. E isto é tênue. A extensão da superfície da Terra nos dá a
falsa impressão que podemos alterar de forma indiscriminada e indefinida o ambiente
em que vivemos. 

Desde há muito os sinais vermelhos de
alertas foram dados. Desmatamento, poluição de rios e da água em geral. Pesca predatória,
uso de energia não renovável, e a poluição generalizada do ar que respiramos já
são bastante conhecidos. Falta agirmos de modo consciente para usufruirmos uma
vida saudável. &nbsp;
<!--[if gte mso 9]>
 
  
  
 
<![endif]-->
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O SISTEMA GAIA



&nbsp;Pág. 93 (7): Para existir um sistema
autorregulado, os organismos da biosfera deviam produzir gases. Por isso, os
diversos organismos deviam produzir e remover certos gases. Podemos dar um
exemplo do ciclo do dióxido de carbono (pág. 93 (5)). O CO2 é um dos principais
gases da estufa. Os vulcões o expelem há milhões de anos. Gaia precisa
expeli-lo para fora da atmosfera. 

De alguma forma, elementos ditos
inanimados como as rochas e os seres vivos tiveram a mesma origem gasosa. Dai
se considerar que a vida e as rochas assim como os gases estão num mesmo ciclo
povoando a Terra. É importante para o entendimento de algo comum entre seres
vivos e os inanimados como rochas, a existência de corais. Não podemos dizer simplesmente
que um coral é uma rocha pois ele é sensível até mesmo ao nosso caminhar sobre
ele. È interessante a existência de certas partes solidas como o marfim
produzido por um ser vivo como o elefante. A pérola nasce de certas &nbsp;conchas. Podemos dizer que a temperatura é um
dado importante para a existência da vida. Também o é um gás como o oxigênio. Um
local como o mangue é fundamental para a reprodução e existência de vários seres.
Portanto, o ecossistema é algo mais complexo do que a coleção de seres vivos.&nbsp; &nbsp;
&nbsp;