𝘾𝙝𝙤𝙤𝙨𝙚 𝙩𝙝𝙚 𝙘𝙤𝙧𝙧𝙚𝙘𝙩 𝙢𝙤𝙙𝙖𝙡 𝙫𝙚𝙧𝙗.
We _________ damage the environment. The planet is in danger.

• mustn't
• don't have to
• didn't have to