the fire which destroyed the electricity plant(passive) might have been caused bythe fire which destroyed the electricity plant

because while authorities at the customs service said the fire started after the gas cylinder of an impounded truck exploded , one of the emergency workers said(passive) was caused bybecause while authorities at the customs service said the fire started after the gas cylinder of an impounded truck exploded , one of the emergency workers said

serious damage to trees and crops ... its effect of public concern which should not be for farmer alone and should be handled with seriousness , practice of burning of fire could also lead to accidental burning of his land and other properties at his disposalcausesserious damage to trees and crops ... its effect of public concern which should not be for farmer alone and should be handled with seriousness , practice of burning of fire could also lead to accidental burning of his land and other properties at his disposal

eyewitnesses say(passive) might have been caused byeyewitnesses say

to climate change and ultimately to food securitycontributingto climate change and ultimately to food security

reduction of visibility by particular matters ... while aiding air stagnation and causing respiratory diseasescould causereduction of visibility by particular matters ... while aiding air stagnation and causing respiratory diseases

haze(passive) caused byhaze

Barack Obama being able to be presidentcreatedBarack Obama being able to be president

pipeline explosion in Niger Deltacausedpipeline explosion in Niger Delta

its negative effects on humanto preventits negative effects on human

loss of undergrowth , useful tree barks that are of medical value and soil to used micro fauna and floracausesloss of undergrowth , useful tree barks that are of medical value and soil to used micro fauna and flora