Public meetings this week look at evaluating superintendent Kenneth Salim, ensuring students’ social, emotional and mental health, building a life sciences center in a drab part of the Alewife Quadrangle and a petition that would urge developers to turn away from fossil fuels.

Public meetings this week look at zoning petitions that would urge developers to turn away from fossil fuels and to build structures of all affordable units, including in parts of the city that have none. Also on agendas are a City Hall-adjacent pot shop and Eversource substation plan.

Residents can exchange up to three incandescent or CFL lightbulbs for LED lightbulbs at upcoming events this spring. The Alliance-hosted swaps, starting Saturday, are free and open to all Cambridge residents.

Today’s massive gas leak in Kendall Square is a safety and health concern for us all and demonstrates everything Mothers Out Front has been saying about the dangers of “natural” gas.

The City of Cambridge and Eversource are launching the Cambridge Multi-Family Energy Pilot program to provides no-cost energy efficiency assessments and solar assessments to owners of multifamily buildings.

Adding solar panels to the Main Library, flashing lights for crosswalks and real-time bus tracking displays led the city’s third annual Participatory Budget process, in which 4,730 residents age 12 and older voted on how to spend $700,000 of the city’s budget.

An informational meeting for a time-limited solar panel installation offer for Cambridge, Somerville and Arlington, Belmont and Watertown will be held at 7 p.m. Oct. 25 in Arlington.

The city is joining in Earth Hour 2016, a worldwide grassroots movement sponsored by the World Wildlife Fund in which people in more than 7,000 cities turn off all nonessential lights for an hour to show they are committed to fighting climate change.