India is the third-largest contributor to global energy use and greenhouse gas emissions, and the country is rapidly urbanizing. Transitioning to low-carbon cities is critical to meeting the country’s climate goals.

An estimated 400 million new residents will migrate to Indian cities by 2050, necessitating major changes in urban infrastructure and planning. On March 27 and 28, M.S.

Shivaji Sondhi, professor of physics, in his column in "The Print," an India-based publication, explains contact tracing in the wake of COVID-19 and why such tracing should be thought of as "conferring a new form of immunity — digital immunity." 

Princeton University researchers have received a $2.5 million federal grant to lead an interdisciplinary effort with academic, city government and nonprofit partners that will develop a scientific process for establishing urban food systems that are less wasteful and environmentally detrimental. The grant will be administered by the Princeton...