mass transit
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Congestion Pricing is Stuck in New York’s Political Traffic
The subway system requires new signals, switches, cars, and expanded routes. While congestion pricing can’t pay for all of that, it can help.
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Q&A With Sustainable Engineering Expert Tom Abdallah
The chief environmental engineer for the MTA New York City Transit is currently teaching the Capstone Workshop in the Sustainability Management masters program.
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New York’s Overly Political Approach to Mass Transit
The time for a comprehensive fix for this region’s mass transit is long overdue.
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Saving the NYC Subways will Require Money and Political Courage
Both our governor and mayor need to place public service above political gain to save our mass transit system.
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Congestion Pricing, Public Housing, and a Sustainable New York City
To be a competitive global city we must become a sustainable city, and we need our governor and mayor to put their political differences aside to address problems of housing and mass transit.
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The Mass Transit Man
Thomas Abdallah, adjunct professor at Columbia University, is working to make the NYC subway system more sustainable.
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Congestion Pricing and a Sustainable NYC
Solving the transit problem is key to New York City’s health and well-being, and a new congestion pricing proposal is serious starting point.
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It’s Time for New York to Save its Mass Transit System
The economic heart of the city cannot beat without an effective subway system. It’s time for the mayor and governor to develop a fully funded, well thought through strategy for mass transit in New York City and its nearby suburbs.

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

