密西西比河 位于阿肯色州和密西西比州交界處的密西西比河 今天是地球日，我們在藍色大理石之上俯瞰阿肯色州和密西西比州邊界的密西西比河。那些小而塊狀的形狀是城鎮(zhèn)、田野和牧場——藍綠色是浩瀚的密西西比河。任何坐過飛機靠窗座位的人，只要凝視過下面的土地，都會感到奇怪，為什么這張照片中的顏色如此不真實。那是因為它們確實是。這些圖片是2013年由美國宇航局的Landsat 7號衛(wèi)星拍攝的，該衛(wèi)星使用熱紅外傳感器幫助科學家更好地區(qū)分植物、動物、水和人造物體。近50年來，NASA一直在使用衛(wèi)星圖像來了解氣候變化和人口增長是如何影響我們脆弱的地球的。這些衛(wèi)星幫助NASA了解森林砍伐和森林火災(zāi)發(fā)生的地方，冰川正在融化的地方，以及上升的水是如何侵蝕城市的。造成這些變化的最大原因是什么?根據(jù)美國宇航局的說法，是人類。自1972年第一顆陸地衛(wèi)星發(fā)射以來，地球人口幾乎翻了一番，從當時的40億人增加到現(xiàn)在的78億人。但是有一些好消息來紀念這個地球日:我們在這里看到的密西西比河現(xiàn)在的毒性比它在1972年的時候要小得多，這要歸功于環(huán)境法律和法規(guī)。

原文:

It's Earth Day today and we are high above the blue marble looking down on the border between Arkansas and Mississippi. Those small, blocky shapes are towns, fields, and pastures–the teal green is the mighty Mississippi River. Anyone who has flown in the window seat of an airplane and has gazed down at Earth below might wonder why the colors in this image are so unreal. That's because they are. These images were taken in 2013 by Landsat 7, a NASA satellite that uses thermal infrared sensors to help scientists better distinguish flora, fauna, water, and manmade objects. For almost 50 years, NASA has been using satellite imagery to understand how climate change and population growth are affecting our fragile planet. These satellites help NASA see where deforestation and wildfires are happening, where glaciers are melting, and how rising waters are encroaching on cities.The biggest cause of these changes? According to NASA, it's us. Since the first Landsat launched in 1972, the Earth's population has almost doubled, from 4 billion people then to 7.8 billion today. But there is some good news to mark this Earth Day: The Mississippi River we see here is much less toxic now than it was back in 1972, thanks to environmental laws and regulations.

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