At the Cancun meeting of the world trade talks in September 2003, a powerful new grouping of developing countries emerged. Led by rapidly growing countries and major exporters like Brazil, China, India, and South Africa, this group has been powerful enough to challenge the EU and the US in trade negotiations.
If the situation is really bad it can even be caused by the rod itself contacting the crankshaft journal (where the bearing has become out of place). The most common cause of rod knock is due to a spun bearing (bearing itself actually spins in the end of the rod so it becomes out of position).
Knocking in a diesel engine is different then knocking in a gas engine. Knocking in a gas engine is very destructive and is caused by two flame fronts colliding with each other. This is cause by certain conditions that can cause pre ignition of the air/fuel mixture separate from the spark.