Carbon footprint, The amount of damage or pollution someone causes to the environment., Throw in the towel, To give up or admit defeat because a task is too hard., At the expense of, Doing something that causes harm to something else in the process., Work up a sweat, To do hard physical work or exercise., Acquire a second language, To learn how to speak another language., Constructive criticism, Helpful feedback that shows you how to improve your mistakes..

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