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Author: Martin Williams Publisher: Princeton University Press ISBN: 0691228892 Category : Science Languages : en Pages : 256
Book Description
The little-known history of how the Sahara was transformed from a green and fertile land into the largest hot desert in the world The Sahara is the largest hot desert in the world, equal in size to China or the United States. Yet, this arid expanse was once a verdant, pleasant land, fed by rivers and lakes. The Sahara sustained abundant plant and animal life, such as Nile perch, turtles, crocodiles, and hippos, and attracted prehistoric hunters and herders. What transformed this land of lakes into a sea of sands? When the Sahara Was Green describes the remarkable history of Earth’s greatest desert—including why its climate changed, the impact this had on human populations, and how scientists uncovered the evidence for these extraordinary events. From the Sahara’s origins as savanna woodland and grassland to its current arid incarnation, Martin Williams takes us on a vivid journey through time. He describes how the desert’s ancient rocks were first fashioned, how dinosaurs roamed freely across the land, and how it was later covered in tall trees. Along the way, Williams addresses many questions: Why was the Sahara previously much wetter, and will it be so again? Did humans contribute to its desertification? What was the impact of extreme climatic episodes—such as prolonged droughts—upon the Sahara’s geology, ecology, and inhabitants? Williams also shows how plants, animals, and humans have adapted to the Sahara and what lessons we might learn for living in harmony with the harshest, driest conditions in an ever-changing global environment. A valuable look at how an iconic region has changed over millions of years, When the Sahara Was Green reveals the desert’s surprising past to reflect on its present, as well as its possible future.
Author: Scientific Council for Africa South of the Sahara. Meeting of Specialists on the Use of Irrigation Water and Drainage in Agriculture Publisher: ISBN: Category : Languages : en Pages : 36
Author: Liam Healy Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Water scarcity is a concern in the Sahara Desert, which has been amplified by climate change and, combined with ever-expanding agriculture, has caused an unprecedented rate of desertification. The region cannot strain water supplies any further and must move towards sustainable methods of water usage, procurement, and preventing desert expansion. A systematic approach using maps layered with specific spatial parameters (topography, infrastructure, climate) is used to define relational and locational sets for water harvesting, and therefore constraints for a sustainable water system for the Sahara Desert. Concentrated regions of activity such as the fog capped Anti-Atlas Mountains and humid valleys of the Niger River all offer the opportunity to further explore several alternative water harvesting methods at a mezzo and micro scale. Architectural interventions at these scales can reveal empirical knowledge of a macro sustainable water system, and in doing this, reconcile an ancient forgotten respect of our water supply.
Author: Thomas H. (Thomas Henry) 1874 Kearney Publisher: Wentworth Press ISBN: 9781360151953 Category : History Languages : en Pages : 38
Book Description
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Author: Thomas Henry Kearney Publisher: Forgotten Books ISBN: 9780265823194 Category : Gardening Languages : en Pages : 40
Book Description
Excerpt from Agriculture Without Irrigation in the Sahara Desert In View Of the interest in farming without irrigation that is now being manifested in the arid portion of the United States, an account of a region where agriculture is carried on under extremely adverse natural conditions is particularly timely. The present paper deals with a highly developed system of date-palm culture in the Oued Souf, a remarkable and little-known part Of the Sahara Desert in northern Africa. Strictly speaking, it is not dry - land agriculture with which we have to do in the Souf region, for while the rainfall is practically nothing and irrigation is impracticable, the roots of the trees quickly find their way to ground Water. However, it is quite possible that similar conditions may be found to exist in this country in some parts of the desert region Of the Southwest, and that the Souf system, with or without irrigation, can be utilized there on a small scale in growing certain orchard crops with a View to forcing fruit to early maturity, so that it can be put upon the market much in ad vance Of the bulk Of the crop. The Oued Souf was Visited by Mr. Kearney at the end Of Novem ber, 1904, the journey having been made from Nefta, in southwestern Tunis, Where he had Spent Several weeks in a study Of the date palm. This expedition to northern Africa was made under the auspices Of the Office of Seed and Plant Introduction and Distribution of the Bureau of Plant Industry. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Tristan Gooley Publisher: The Experiment ISBN: 1615191550 Category : Sports & Recreation Languages : en Pages : 320
Book Description
From the New York Times-bestselling author of The Secret World of Weather and The Lost Art of Reading Nature’s Signs, learn to tap into nature and notice the hidden clues all around you Before GPS, before the compass, and even before cartography, humankind was navigating. Now this singular guide helps us rediscover what our ancestors long understood—that a windswept tree, the depth of a puddle, or a trill of birdsong can help us find our way, if we know what to look and listen for. Adventurer and navigation expert Tristan Gooley unlocks the directional clues hidden in the sun, moon, stars, clouds, weather patterns, lengthening shadows, changing tides, plant growth, and the habits of wildlife. Rich with navigational anecdotes collected across ages, continents, and cultures, The Natural Navigator will help keep you on course and open your eyes to the wonders, large and small, of the natural world.
Author: C. N. Duckworth
Author: C. N. Duckworth
Author: Martin Williams
Author: Scientific Council for Africa South of the Sahara. Meeting of Specialists on the Use of Irrigation Water and Drainage in Agriculture
Author: Barbara E. Barich
Author: Thomas Henry Kearney
Author: Liam Healy
Author: Thomas H. (Thomas Henry) 1874 Kearney
Author: Thomas Henry Kearney
Author: Scientific Council for Africa South of the Sahara
Author: Tristan Gooley