There is only one Earth, so humans must do everything they can to conserve Earth's environment now, i.e. by taking steps to mitigate climate change, etc.

Done without looking.

Your purchases are on the house; you will not be charged for your purchases; said to insist on comping or treating a customer. / Said to refuse service to a customer.

simple past tense and past participle of no-mark

(idiomatic) Without any apparent cause or justification.

A bridge crossing the military demarcation line between North Korea and South Korea.

simple past tense and past participle of make no odds

(dated, rare) If one does not work, one shall not eat.

(slang) Used to emphasize that one is telling the truth.

simple past tense and past participle of pay no heed