Jian River

April 22 will mark Earth Day worldwide, an event now in its 42nd year and observed in 175 countries. The original grass-roots environmental action helped spur the Clean Water Act and Clean Air Act in the United States. Gathered here are images of our planet's environment, efforts to utilize renewable alternative sources of energy, and the effects of different forms of pollution. -- Lane Turner and Leanne Burden Seidel (35 photos total)
A ladybug in flight spreads its wings as it flutters from grass blade to grass blade at Rooks Park in Walla Walla, Wash. on April 2, 2012. (Jeff Horner/Walla Walla Union-Bulletin/Associated Press)

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. [36 photos]

A journalist takes a sample of polluted red water from the Jianhe River in Luoyang, Henan province, China, on December 13, 2011. According to local media, the sources of the pollution were two illegal chemical plants discharging their production wastewater into the rain sewer pipes. (Reuters/China Daily)