bomb disposal and disarming.--Stephen V Cole
 The Green Line; During the Lebanese civil  war of 1975-1990, Christians and Moslems fought bitterly over political,  cultural and, ultimately, religious differences. The capital, Beirut, was  divided into Christian and Moslem sections by the Green Line. The name came from  the fact that in this ruble filled no man's land, only grass and weeds survived.  There have been a lot more Green Lines since then. Few realized it at the time,  but this war was but the first of many between Christians and Moslems in the  20th and 21st centuries.
Many  of the earliest Moslem converts were Christians. And many of the peoples Moslem  armies unsuccessfully sought to conquer were Christian. But Islam as a political  force was in decline for several centuries until the 1970s. Then things changed,  and continue to change. Islam was again on the march, and few have noticed how  many places it was turning into religious war with Christians and other  non-Moslems. 
In Asia we  have a green line between India and Pakistan. Inside India, many Moslem  communities remain, and feelings aren't always neighborly. Indonesia and the  Philippines suffer growing strife between Moslems and non-Moslems. Malaysia has  more fanatical Moslems persecuting more laid back ones. China has a large Moslem  community that generates an increasing amount of violence. Russia and America  have formed a curious partnership to deal with Islamic based terrorism coming  out of Afghanistan. And in Chechnya, Russia faces Islamic inspired violence all  alone. 
Africa has a  rather dusty green line south of the semi-arid Sahel region. Many African  nations are split by increasingly sensitive religious differences. The Moslems  are in the north, Christians and animists in the south. Nigeria, Chad and Sudan  are among the more violent hot spots at the moment. Although when the Moslem  Somalis stop fighting each other they will return to raiding their Christian and  animist neighbors to the south.
The Middle East still contains many of non-Moslems. None  have their own country, except for Israel. But Egypt contains five million  Copts, native Christians who did not convert to Islam. Similar small Christian  communities exist throughout the Middle East, and growing hostility from Moslem  neighbors causes many to migrate, or get killed. Moslems have also turned their  righteous wrath on dissident Moslem sects. The Druze and Alawites are considered  by many Moslems as pagans pretending to be Moslems. Similarly, the Shias of Iran  and neighboring areas are considered less orthodox not just for their admitted  differences, but because many adherents openly practice customs of the  pre-Islamic Zoroastrian religion. These differences are less frequently  overlooked today. To survive, the many Druze have allied themselves with Israel,  and most of the current Syrian leadership are Alawites. 
Even Europe as a Green Line. The  Moslems in the Balkans (Albanians and Bosnians) have been a constant source of  strife for the last decade. Moslem migrants in Europe face even more persecution  because of all those Green Lines, and this makes it easier for radical groups to  recruit and carry out their crusade against Christians.
But the Green Lines are about more  than religion. A lot of it is politics. One of the reasons Islam ran out of  steam centuries ago was that the Moslem areas never embraced democracy. Until  the 20th century, most Moslems lived in colonies or totalitarian kingdoms. The  colonies are gone, but democracy has had a hard time taking hold. The  dictatorships are still there. And the people are restless. Radical Islam arose  as an alternative to all the other forms of government that never seemed to  work. In theory, establishing "Islamic Republics" would solve all problems.  People could vote, but only Moslems in good standing could be candidates for  office. A committee of Moslem holy men would have veto power over political  decisions. Islamic law would be used. It was simple, and it makes sense to a lot  of Moslems in nations ruled by thugs and thieves. 
Islamic Republics don't seem to  work. The only one that has been established (not counting others that say they  are but aren't) is in Iran. The major problems were two fold. First, the  radicals had too much power. Radical religious types are no fun, and you can't  argue with them because they are on a mission from God. Most people tire of this  in short order. To speed this disillusionment, many of the once poor and now  powerful religious leaders became corrupt. This eventually sends your popularity  ratings straight to hell. 
It will take a generation or so for everyone in the Moslem  world to figure out where all this is going. This is already happening in Iran,  where moderates are getting stronger every day and everyone is trying to avoid a  civil war. While the radicals are a minority, they are a determined  bunch. 
Radicals  throughout the Moslem world continue to take advantage of dissatisfaction among  the people and recruit terrorists and supporters. To help this process along  they invoke the ancient grudges popular among many Moslems. Most of these  legends involve Christians beating on Moslems. To most radicals it makes sense  to get people agitated at far away foreigners rather than some strongman  nearby.
Most radicals lack the  skills, money or ability to carry their struggle to far off places. So most of  the agitation takes place among Moslem populations. Any violent attitudes  generated are easily directed at available non-Moslems. Thus we have all those  Green Lines. But the more violence you have along those Green Lines, the more  really fanatical fighters are developed. These are the people who are willing to  travel to foreign lands and deal with non-believers, and kill them for the  cause. We call it terrorism, the fanatics call it doing what has to be done. All  because of religious wars in far off places.
When it comes to terrorism, the world is a very small  place.