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What Are The Main Forces That Produce Precipation And Aridity

What are the main forces that produce precipation and aridity?

The primary factor in precipitation is the Hydrologic cycle. Precipitation falls on land, the water drains to rivers which flow to the ocean. Sunlight causes evaporation, evaporated water forms clouds, which then precipitate repeating the cycle.
Another significant factor is wind. Air from humid regions moved by wind processes will increase the humidity of the region which receives the air. Likewise dry air will increase the aridity of a region that receives it.

What are the implications of global warming in the next few decades?

100's of thousands of premature deaths world wide annually - 400,000 per the most complete analysis in 2012 with an upward curve - Climate Vulnerability Monitor 2012Potentially 1,700 US cities below sea level by the end of the century - extraordinary engineering costs to preserve cities or expensive relocations - More Than 1,700 U.S. Cities Underwater By 2100: StudyEntire nations disappearing - Tuvalu, the Maldives, Micronesia and Kiribati are projected to disappear entirely or become completely uninhabitable requiring complete relocation of populations - 11 Islands That Will Vanish When Sea Levels RiseIncreased famine world wide - Climate Change and FamineIncreased spread of tropical infectious diseases such as Dengue Fever, West Nile Virus, and Lyme Disease worldwide - Climate Change Threatens Health: Infectious DiseasesMany areas will experience much deeper, longer and more devastating droughts - Global Warming Effects on DroughtIncreased power of hurricanes and typhoons world wide causing increased damage and death - Super Typhoon Haiyan: A Hint Of Storms To Come? - wunderground.comSubstantial economic losses to the global economy - 6 ways global warming could cost the economyLots of absurd reactions which will remind you of the fable of King Canute such as North Carolina's requirement that waterfront communities ignore the state's own ocean level rising predictions when planning - Update: Revised North Carolina Sea Level Rise Bill Goes to GovernorDisruptive transformation of the energy and transportation sectors - Climate Impacts on Energy, Climate Impacts on Transportation

Why are most of the world’s deserts located on the Western margins of continents in the subtropics?

Have already answered this question. That question although was specific to hot deserts and specified latitudinal extent too, but answer will remain same for your question too. Here it is:-Hot Deserts of the WorldArabian Desert in Arabian peninsulaGreat Sandy, Victoria, Simpson, Gibson and Sturt deserts in AustraliaChihuahuan Desert in north central MexicoKalahari Desert in south-western AfricaMojave Desert in USAMonte Desert in ArgentinaSahara Desert in North AfricaSonoran Desert in North and Central AmericaThar Desert in India and PakistanThere are four major reasons responsible for why the major hot deserts of the world are located between 20°-30° N on the west of the continents:-Offshore trade winds in the region and location in rain shadow zone:- Trade winds that blow in the region, shed their moisture on the eastern part and by the time they reach the western margin, they become dry.Anticyclonic conditions:- Areas between 20–30 degree latitudes on western margins of continents are the regions of descending air. It means the air gets compressed and warm as it descends and thus the moisture keeps decreasing.Leeward sides of mountains/parallel mountain ranges:- In the case of few deserts, mountains are situated as a barrier which prevents orographic rainfall. For example:- presence of Rockies on the western coast of North America does not let moisture bearing winds do rainfall in leeward sides. In the case of Thar desert in India, Aravallis are situated parallel to the region. Therefore the moisture holding winds pass away from the region because there is absence of mountain barriers.Presence of cold ocean currents along the western coast of continents tend to stabilise the air over the coast. This prevents cloud formation and rainfall.You can see it here in the map that major deserts are located on the western parts of continents between 30 degrees North and South latitudes.

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