Massive burning of forests for agriculture thousands of years ago may have increased atmospheric carbon dioxide enough to alter global climate and usher in a warming trend that continues today, according to a new study that appears online Aug. 17 in the journal Quaternary Science Reviews.
Researchers at the University of Virginia and the University of Maryland-Baltimore County say that today’s 6 billion people use about 90 percent less land per person for growing food than was used by far smaller populations early in the development of civilization. Those early societies likely relied on slash-and-burn techniques to clear large tracts of land for relatively small levels of food production.
“They used more land for farming because they …

The progressive degradation of useful soils for agriculture and farm animal husbandry is a growing environmental and social problem, given that it endangers the food safety of an increasing world population.
This fact prompted the Basque Institute for Agricultural Research and Development – Neiker-Tecnalia – to design a series of research projects in order to evaluate alternative agricultural practices, as a function of their capacity to combine the productivity of crops with the health of the soil.
Conclusions of great interest for the agricultural and animal husbandry sector were drawn from the studies. Neiker-Tecnalia was able to show that, on extensive mountain pastures, lime sand and wood ash are a viable alternative to quicklime as a liming …