Hi everybody. Wednesday is Earth Day, a day to appreciate and protect this precious planet we call home. And today, there's no greater threat to our planet than climate change. 2014 was the planet's w
Hi, everyone. I'm Sirena. I'm 11 years old and from Connecticut. Well, I'm not really sure why I'm here. 大家好，我叫黄凱珉。我今年十一岁，来自康涅狄格州。嗯，我确实不知道我为什么会在这里。 I mean, what does this have to do with technology, e
全球变暖是我们目前面临的一个大问题，不过全世界都过分关注二氧化碳，却忽略了另外一个重要的气体——甲烷。 Fred Krupp: Let's launch a satellite to track a threatening greenhouse gas 我们能否发射一颗卫星来追踪威胁地球的温室气体？ We've got a big problem on our hands with global
