VOA慢速英语:瑞典青少年为美国带来了气候活动

old-fashioned - adj. of or relating to the past

global warming - n. the recent increase in the world's temperature that is believed to be caused by the increase of certain gases (such as carbon dioxide) in the atmosphere

pinch oneself - idiom. used to express that you do not believe that a good thing is really happening

actually - adv .used to refer to what is true or real

credibility - n. the quality of being believed or accepted as true, real, or honest

motivated - adj. giving (someone) a reason for doing something

refer - v. to send (someone or something) to a particular person or place for treatment, help, advice, etc.

proper - adj. correct according to social or moral rules

convince - v. to cause (someone) to believe that something is true