But they also pollinate nearby apple trees, a useful service that is not purchased or priced.

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Embrapa's latest trick is something called forest, agriculture and livestock integration: the fields are used alternately for crops and livestock but threads of trees are also planted in between the fields, where cattle can forage.

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The BBC's Raphael Tenthani in Blantyre says most schools in Malawi have some buildings, but there are also classes taught under trees.

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The caterpillars strip oak trees of their leaves but are also toxic to people.

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The visual posters include not only photographs of the species but also vivid illustrations on the use of the trees and plants by Khmer artist, Poy Chhunly, from the PHARE School of Arts in Battambang.

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Roosevelt is stark and elemental but also very lyrical in the careful dialogue it arranges between trees, stone, sky and water (and so well conceived and executed that Superstorm Sandy didn't leave a scratch).

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But it also eliminated the challenge of building around all the old trees on their lot.

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That means that it may take a long time not only to clear, but also to get, for example, the power companies back in to clear trees and to put things back in place so that folks can start moving back home.

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This result can provide a stunningly detailed view of the genome, but this letter-by-letter approach may also sometimes result in scientists missing the forest for the trees.

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