"Thus human beings are now carrying out a
large scale geophysical experiment of a kind
that could not have happened in the past nor
be reproduced in the future. Within a few
centuries we are returning to the atmosphere
and Oceans the concentrated organic carbon
stored in sedimentary rocks over hundreds of
millions of years."
1957-ROGER REVELLE and HANS E. SUESS
jueves, 27 de octubre de 2011
viernes, 29 de julio de 2011
sábado, 2 de julio de 2011
lunes, 16 de mayo de 2011
sábado, 14 de mayo de 2011
jueves, 5 de mayo de 2011
martes, 8 de marzo de 2011
jueves, 3 de febrero de 2011
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