That depends. If you're talking about the environment in general (e.g. that it's in danger due to pollution), then no. But if you're talking about a habitat of sorts (e.g. where a bird lives is its "environment"), then yes.
Cylinders.
McDonald's
boats
cobwebs
Martinez's
You wouldn't pluralize "processing", but you would pluralize "process" making more than one process "processes".
Handkerchiefs is correct.
Fournesses is the plural of Fourness
Folisis is the plural of Folisi
Sirs is the plural of sir
Do you mean, "How do you pluralize the phrase 'follow God's word' ? 1) Follow the words of God, or 2) Follow God's words.
The plural form of panic is panics.