World Water Day

Tomorrow, March 22, is World Water Day, an event established by the United Nations in 1993 to highlight the challenges associated with this precious resource. Each year has a theme, and this year's is "Water and Food Security." The UN estimates that more than one in six people worldwide lack access to 20-50 liters (5-13 gallons) of safe freshwater a day to ensure their basic needs for drinking, cooking, and cleaning. And as the world's population grows beyond 7 billion, clean water is growing scarcer in densely populated areas as well as in remote villages. Collected here are recent images showing water in our lives -- how we use it, abuse it, and depend on it.

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  • R S Iyer / AP

    Delhi's Toxic Sky

    Toward the end of autumn, parts of northern India and Pakistan are frequently covered by a thick smog caused by a temperature inversion. This year is particularly bad.

  • Ross Burgener / NOAA, OAR, ESRL, GMD

    A Photo Trip to Antarctica

    Images from the past few years of the Antarctic landscape, wildlife, research facilities, and some of the scientific work taking place there.

  • Yasuo Osakabe / U.S. Air Force, 374th Airlift Wing

    Photos of President Trump's Trip to Asia

    For the past 12 days, President Trump has been on a wide-ranging tour across Asia.

  • Hannah Mckay / Reuters

    Photos of the Week: 11/4–11/10

    A cross-border mass on the Rio Grande, First Lady Melania Trump visits the Great Wall, terrible smog in India, a bear prepares for hibernation in Kosovo, and much more.

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