By Vaclav Smil
The biosphere -- the Earth's skinny layer of existence -- dates from approximately 4 billion years in the past, whilst the 1st easy organisms seemed. Many species have exerted huge, immense impact at the biosphere's personality and productiveness, yet none has remodeled the Earth in such a lot of methods and on the sort of scale as "Homo sapiens."
In Harvesting the Biosphere,Vaclav Smil bargains an interdisciplinary and quantitative account of human claims at the biosphere's shops of residing topic, from prehistory to the current day. Smil examines all harvests -- from prehistoric man's looking of megafauna to fashionable crop construction -- and all makes use of of harvested biomass, together with power, nutrients, and uncooked fabrics. with no harvesting of the biomass, Smil issues out, there will be no tale of human evolution and advancing civilization; yet even as, the expanding volume and depth of present-day biomass harvests are altering the very foundations of civilization's well-being.
In his distinct and accomplished account, Smil provides the absolute best quantifications of previous and present international losses so as to investigate the evolution and quantity of biomass harvests. Drawing at the most modern paintings in disciplines starting from anthropology to environmental technological know-how, Smil bargains a beneficial long term, planet-wide standpoint on human-caused environmental swap.
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Publication Date: 2008-04-08
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Additional resources for Harvesting the Biosphere: What We Have Taken from Nature
The African elephant (Loxodonta africana), the largest surviving terrestrial mammal, has its highest densities (in excess of 3,000 kg/km2) on natural grasslands in the eastern part of the continent; the rate can be an order of magnitude lower on transformed grassland and in most parts of West Africa (Sinsin et al. 2002). But even the smaller forest elephant (L. africana cyclotis) can have a biomass of 2,000–3,000 kg/km2 (White 1994; Morgan 2007). In contrast, the biomass density of all small mammals (mostly rodents) in temperate grasslands and forests rarely surpasses 3 kg/ha, and their most common biomass densities are less than 1 kg/ha (French et al.
This would be only the best-fit values as the actual densities for every mass category range over at least two (and even three) 22 Chapter 2 orders of magnitude. 2 kg/ ha), a rate confirmed by field studies (Golley et al. 1975). 7 g/m2 (Madsen et al. 2006). In accounts of mammalian zoomass, it is not surprising that ecologists have paid particular attention to the world’s richest assemblages of large herbivores, in Africa’s savannas and rain forests, where the mean mass of mammals is significantly greater than in Amazonia (Cristoffer and Peres 2003).
The NPP of major biomes ranges from negligible amounts in extreme environments (hot or cold deserts) to nearly 1 kg C/m2 (20 t/ha) in the richest tropical rain forests. Forest NPP is higher than the productivity of grasslands growing in the same environment because trees have a much higher leaf area index (LAI), the upper area of foliage per unit area of ground that captures solar radiation. While grasslands typically have an LAI no higher than 3, and often less than 2, mean values for forest are above 3 even for boreal growth, and are commonly more than 5 for multistory temperate and tropical trees with heavy canopies (Myneni et al.