> vida <


Tanto tempo sem escrever e vou quebrá-lo com uma misera, mas interessante citação de um livro que estou a ler.

"In a physical context, the science of thermodynamics tells us that energy is always moving to a lower level of intensity or organization. The disorganization of this energy in the form of the bonding and motion of molecules and atoms (entropy) is always increasing. Thus, in Earth's time frame, the universe has been running down like a battery, as matter flies out from the big bang. Some billions of years from now this almost inconceivable collection of matter and energy is heading for death close to absolute zero. Perhaps when it has converted all its energy to the gravitational form, it then collapses to another big band and a rebirth. Our concern here, however, is the running down process. On the time frame of hours to years rather than a few billion years, life temporarily reverses this apparent senescence. It is capable of collecting small amounts of mostly solar energy to chemically organize and to store that energy and direct it to rather intensive usage. On the scale of the individual, life can literally store and concentrate solar energy, eventually to defy gravity. On the scale of the community it can concentrate energy to be released as heat a few or millions of years later; on the scale of the biosphere, life has been and still is capable of massive alterations of our planet's surface. The oxygen rich atmosphere that allows a rapid scale of animal life and has in part given us equitable temperatures for several billions of years, the very soil that supports so much terrestrial biomass, the organic-rich sediments that become an integral part of earth geology (perhaps as some would have it even allowing the continental drift and the essential features of the earth's geology) are all part of the accomplishments of life. These are unique features of a living earth. They are contrary to what the physical evolution of the solar system would have offered."

Adey / Loveland, Dynamic Aquaria 1991