Pros: create jobs,roads are built,timber is produced for use as structural material for construction of houses,to produce pulpwood for paper production. Cons:Cutting trees is bad , trees retain water,regulate flow of rivers,prevent flood,avoid land dryness .Trees prevent erosion, play an important role in producing oxygen and reducing carbon dioxide in the atmosphere, as well as moderating ground temperatures.Logging is also a dangerous occupation.-------These links should help.--- Trees are an important component of the natural landscape because of their prevention of erosion and the provision of a weather-sheltered ecosystem in and under their foliage. They also play an important role in producing oxygen and reducing carbon dioxide in the atmosphere, as well as moderating ground temperatures. They are also elements in landscaping and agriculture, both for their aesthetic appeal and their orchard crops (such as apples). Wood from trees is a building material, as well as a primary energy source in many developing countries. http://en.wikipedia.org/wiki/Tree
----- Logging is the process in which certain trees are cut down by a lumberjack or machine, such as the feller buncher, for forest management and timber.
In forestry the term logging is sometimes used in a narrow sense concerning the logistics of moving wood from the stump to somewhere outside the forest, usually a sawmill or a lumber yard. However, in common usage, the term may be used to indicate a range of forestry or silviculture activities. For example the practice of the removal of valuable trees from the forest has been called selective logging, sometimes confused with selection cut.
Illegal logging refers to what in forestry might be called timber theft
In common usage what is sometimes called clearcut logging is not is necessarily considered a type of logging but a harvest or silviculture method and is simply called clearcutting or block cutting. In the forest products industry logging companies may be referred to as logging contractors.
Logging usually refers to above-ground forestry logging. Submerged forests exist on land that has been flooded by damming to create reservoirs. Such trees are logged using underwater logging or by the lowering of the reservoirs in question. Ootsa Lake and Williston Lake in British Columbia, Canada, are notable examples where timber recovery has been needed to remove inundated forests.
------------ Felled logs are then generally transported to a sawmill to be cut into timber, a paper mill for paper pulp, or for other purposes like fence posts. Log transportation can be challenging and costly since trees are often far from navigable roads. Road building and maintenance may be restricted in National Forests or other wilderness areas since it can cause erosion in riparian zones. When felled logs sit adjacent to a road, heavy machinery may simply lift logs into trucks. http://en.wikipedia.org/wiki/Logging#Transporting_logs
Logging is a dangerous occupation. In the United States, it has consistently been one of the most hazardous industries. In 2008, the logging industry employed 86,000 workers, and accounted for 93 deaths. This resulted in a fatality rate of 108.1 deaths per 100,000 workers that year. This rate is over 30 times higher than the overall fatality rate in the US in 2008 Loggers work with heavy, moving weights and the use of tools such as chainsaws and heavy equipment on uneven and sometimes unstable terrain. Loggers also deal with severe environmental conditions, such as inclement weather and severe heat or cold. An injured logger is often far from professional emergency treatment.
Traditionally, the cry of "Timber!" developed as a warning alerting fellow workers in an area that a tree is being felled, so they should be alert to avoid being struck. The term "widowmaker" for timber that is neither standing nor fallen to the ground demonstrates another emphasis on situational awareness as a safety principle.
The risks experienced in logging operations can be somewhat reduced, where conditions permit, by the use of mechanical tree harvesters, skidders and forwarders.
Lumber or timber is wood that is used in any of its stages from felling through readiness for use as structural material for construction, or wood pulp for paper production..http://en.wikipedia.org/wiki/Timber