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Be more specific. Dark sludge could be mold, resin, tar or even food.
Ozone depletion could be avoided easily. You have to plant more and more trees.
No they couldn't have avoided it.
One way of describing a "hazardous materials incident" would be "an accident where hazardous materials are present." However, many people are uncomfortable with the use of the word "accident" which implies an unplanned event that could not have been avoided. That is why the word "incident" is used in the first place. It does not carry any implication of inevitability.
Footage. You could have footage of the incident, or you could have a collection of footage of the incident.
ANY WAR can be avoided; but man likes war.
The Vietnam War might have been avoided, if communism had not been involved.
Yes
yes
No
yes
I dont know