Elizabeth Kolbert, staff writer at the New Yorker and Pulitzer Prize-winning author and journalist, spoke at the Climate School on Monday for its first Signature Speaker Series event of the year. The talk was titled “Under a White Sky: Solar geoengineering and other bright ideas.”

Columbia Facilities and Operations cut down seven trees on College Walk due to “trunk decay and other irreversible conditions” after high winds and precipitation prompted safety concerns, according to a Tuesday news release and a sign posted on campus.