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También se llama "libro" a una obra de gran extensión publicada en varias unidades independientes, llamados "tomos" o "volúmenes".

Otras veces se llama también "libro" a cada una de las partes de una obra, aunque físicamente se publiquen todas en un mismo volumen (ejemplo: Libros de la Biblia).

It has been argued (unsuccessuly) that the current change in climate will cause millions to billions of “climate refugees”.

Some of these claims have been so “over the top” that they were quietly withdrawn and swept under the rug.

The analyses showed that the time people migrated out of Africa coincided with a big shift to a much drier and colder climate, Tierney said.

The team’s findings are corroborated by research from other investigators who reconstructed past regional climate by using data gathered from a cave formation in Israel and a sediment core from the eastern Mediterranean.

Tierney said before this research there was no record of the climate of northeast Africa back to the time of human migration out of Africa.

“Our data say the migration comes after a big environmental change.

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El libro digital o libro electrónico, conocido como e-book, está viendo incrementado su uso en el mundo del libro y en la práctica profesional bibliotecaria y documental.

The first challenge was finding a core from that region with sediments that old.

The researchers enlisted the help of the curators of the Lamont-Doherty Core Repository, which has sediment cores from every major ocean and sea.

The algae change the composition of the alkenones depending on the water temperature.

The ratio of the different alkenones indicates the sea surface temperature when the algae were alive and also reflects regional temperatures, Tierney said.

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