“Globally, nearly one billion people still lack access to safe water,” said Sasha Koo-Oshima, Senior International Water Advisor for the U.S. Environmental Protection Agency, at a recent Wilson Center event on the potential challenges and opportunities of wastewater treatment. “In emerging developing countries, children lose 443 million school days per year due to diseases related to water, sanitation, and hygiene,” she said.

Plastics. From the devastating effects of plastic pollution on our oceans, to the news that plastic bottles likely pollute the drinking water they contain, plastic pollution—the theme of this year’s Earth Day—has been a highly visible issue, and we’ve seen some notable progress on fighting the plastic battle.  

The Lanjiang river in Eastern Zhejiang, China, reached its peak water level of 100 feet the night of June 25, 2017. Lanxi residents remember this day as “6.25,” marking the worst flood since 1955. Elsewhere in China that month, 7.3 million people were affected by floods, landslides, and heavy rains in northwestern Sichuan Province alone. Northern Guangxi suffered direct economic losses of 2.9 billion RMB (US$460 million). In the autonomous regions, 92,000 people were relocated. Flash floods caused the deaths of 10 people and forced 76,800 people to evacuate from Shanxi Province.

Without warning, water rushed into a woman’s home on a raised platform above the floodplain of Bangladesh’s Teesta River. She was just a hand’s distance from her infant son, but she couldn’t stop him from falling into the floodwaters. “She can’t recover back from the trauma,” said the University of Dundee’s Nandan Mukerjee of the mother who lost her child to the currents of climate change.

The first U.S. city to host a docked bike-share system, Washington, D.C., is now home to a rapidly growing influx of dockless bikes, with five companies vying for the market. The docked system still accounts for 87 percent of the shared bikes in the United States, but the number of dockless bikes—which can be located by riders using an app and then left anywhere—is growing rapidly. The data from these location-enabled bikes provide a unique opportunity to measure the point-to-point transportation needs of millions of people in some of the world’s densest cities.

$1 billion sales in two minutes. More than 250,000 purchases every second. Singles’ Day, China’s annual retailing extravaganza, absolutely crushes Black Friday: E-commerce giant Alibaba raked in $17.8 billion in gross sales during last year’s event, more than double the combined total of $6.8 billion in sales during the United States’ 2016 holiday shopping kick-off. The shopping spree lasts only 24 hours, but its environmental impacts will extend for decades.

As the so-called Islamic State loses control over the areas it once occupied, it is leaving behind a toxic legacy.  The initial findings of a scoping mission undertaken by UN Environment Programme’s Conflict and Disasters branch found a trail of localized pollution that could have acute and chronic consequences for Iraq—and not just for its environment.