1962
in addition , soil and river systems have been contaminated by the harsh chemicals used in cocaine production and the air has been polluted by the smoke caused by the burning of jungle and forest for coca bush cultivation .
 cause effect: smoke, burning
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: component whole, NA, instrument agency, member collection, cause effect, entity destination, content container, message topic, product producer, entity origin 
Text: {0} 
Answer:
 cause effect: smoke, burning