verb
BAD : Nowadays world peace is menaced.
GOOD : Nowadays world peace is threatened.
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Menace is usually used as a noun or adjective: 'These street gangs are a social menace.' 'He was convicted of menacing behaviour.' Menace is not often used as a verb. It appears mainly in formal styles and means 'make or try to make someone feel their life or safety is in great danger': 'His mighty war machine continues to menace neighbouring countries.'
When you are talking about something which is a danger to peace, survival, safety, health, happiness, etc, use threaten : 'These poisonous liquids threaten the drinking water supply of two million people.' 'AIDS could threaten the economic well-being of Asian countries.'