The designations employed and the presentation of material in this information
product do not imply the expression of any opinion whatsoever on the part of the
Food and Agriculture Organization of the United Nations (FAO) concerning the
legal or development status of any country, territory, city or area or of its authorities,
or concerning the delimitation of its frontiers or boundaries. The mention of specific
companies or products of manufacturers, whether or not these have been patented,
does not imply that these have been endorsed or recommended by FAO in preference to
others of a similar nature that are not mentioned.
The views expressed in this information product are those of the author(s) and do not necessarily reflect the views or policies of FAO.
ISBN 978-92-5-107823-5 (print)
E-ISBN 978-92-5-107824-2 (PDF)
FAO encourages the use, reproduction and dissemination of material in this information
product. Except where otherwise indicated, material may be copied, downloaded and
printed for private study, research and teaching purposes, or for use in non-commercial
products or services, provided that appropriate acknowledgement of FAO as the source
and copyright holder is given and that FAO’s endorsement of users’ views, products or
services is not implied in any way.
All requests for translation and adaptation rights, and for resale and other
commercial use rights should be made via www.fao.org/contact-us/contact-us/licence-request/en/.
FAO information products are available on the FAO website (www.fao.org/publications) and can be purchased through firstname.lastname@example.org.