T oday, some ofthem are seldom seen.Indeed,any threat(威胁)tothe environment is particularly serious in Africa, because around 70percent of people still live primarily off the land. Wildlife-basedtourism ranks among the top three contributors to GDP in mostsouthernAfrican countries.Sayerbelieves ...
Desertification is accomplished primarily through the loss of stabilizing natural vegetation and the subsequent accelerated erosion of the soil by wind and water. 沙漠化主要由以下过程导致:首先稳定的自然植被不断减少,随后,风吹雨淋加速侵蚀土壤。 全句 Desertification is accomplished primarily through the los...
A woman in Nigeria pouring grains of millet into a bowl in the village of Sadongori Kolita, near Maradi. Low rainfall and locusts caused a food crisis during the summer of 2005. In general, desertification is caused by variations inclimateand by unsustainable land-management practices in dryla...
He ignored theextinction which wiped out the dinosaurs (恐龙) 65million years ago, because many scientists believe it was primarily caused bythe impact of an asteroid (小行星). Hethinks that older volcanoes had more killing power because more recent lifeforms were better adapted to dealing with...
aThe National Health Service (NHS) is the shared name of three of the four publicly funded healthcare systems in the United Kingdom. The systems are primarily funded through general taxation rather than requiring insurance payments, and were founded in 1948. They provide a comprehensive range of...
There is little doubt, however, that desertification in most areas results primarily from human activities rather than natural processes.(然而,几乎毫无疑问,大多数地区的沙漠化主要是由于人类活动而不是自然过程造成的。) The expansion of desert-like conditions into areas where they did not previously ex...
In general, the results of systematic monitoring, and analyses of the causes of desertification and the contemporaneous human impacts, suggest that desertification in China has been primarily caused by climate change, and Particularly by Strong wind regimes (with high sand transport potential) ...
the results of systematic monitoring, and analyses of the causes of desertification and the contemporaneous human impacts, suggest that desertification in China has been primarily caused by climate change, and particularly by strong wind regimes (with high sand transport potential) accompanied by decrease...
Desertification is accomplished primarily through the loss of stabilizing natural vegetation and the subsequent accelerated erosion of the soil by wind and water.In some cases the loose soil is blown completely away, leaving a stony surface.In other cases, the finer particles may be removed, while...
Efforts to stop desertification—the process by which fertile land becomes desert—have been primarily focused on expensive manual solutions. From MIT Technology Review At his office, he showed me a series of maps that document China’s elevation, watersheds, flood paths, biodiversity, desertification...