PIA_41
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https://prezi.com/m/_s6fiw2ex1fj/como-se-ha-incrementado-la-concetracion-de-co2-enla-atmosf/<br />
https://www.google.com.mx/url?sa=t&source=web&rct=j&url=http://www.ldeo.columbia<br />
.edu/users/gregory/CicloCarbono.pdf&ved=0ahUKEwjV_IWt25jSAhUB-<br />
2MKHSVxBvwQFggkMAE&usg=AFQjCNEdQhDDzYuUnAEjIquoeftTGELXvg&sig2=y4DO8Vq_<br />
BT_zpzX95FjALA<br />
http://www.ciclodelcarbono.com/ciclo_biolgico_del_carbono