contamination
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How Much Arsenic is Too Little?
Five hundred utilities in the U.S. provide drinking water with unsafe levels of arsenic, the Environmental Protection Agency says. But how many people are getting too much arsenic in their water is much less clear, according to a study conducted in part by the Columbia Water Center.
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Brownfields: Untold Stories, Unrealized Value
Across the country, in distressed urban centers, hundreds of thousands of industrial sites have been left lying fallow. These properties, known as brownfields, embody the story of America’s twentieth-century industrial might and bear the mark of that period’s unenlightened practices. Their closing and subsequent abandonment culminated in the loss of well-paying manufacturing jobs, the creation…
COP31, the 2026 United Nations Climate Change Conference, aims to advance dialogue, strengthen consensus, and accelerate climate action on a global scale. From November 9–20, 2026 in Antalya, Türkiye, heads of state, ministers, scientists, business leaders, and civil society will gather to advance efforts in emission targets, climate finance, and adaptation and resilience. Once again, our experts, students, and global thought leaders from Columbia Climate School and across Columbia University are contributing to key events, sharing insights, and helping shape the dialogue toward ambitious, science-based solutions. Learn More
