Gov. Deval Patrick’s Massachusetts Clean Energy and Climate Plan for 2020 is getting a close look at 7 p.m. March 29. The plan sets statewide goals for cutting greenhouse gas emissions over the next nine years and by 2050, and the meeting is intended to look at how Cambridge and Somerville can help.

“This is probably the most important issue of our time, and with the federal government and [Environmental Protection Agency] falling back on the need for regulation, the state efforts have to move forward,” said Cambridge writer Tom Olbert in a comment on the website of Cambridge-Somerville for Change, an event sponsor.

The state’s plan — setting greenhouse gas limits of between 10 percent and 25 percent below 1990 levels for 2020 “on the way toward an 80 percent reduction in emissions by 2050” — is to be presented by David Cash, of the Massachusetts Executive Office of Energy and Environmental Affairs.

State Rep. Will Brownsberger and Eugenia Gibbons, program coordinator for the Environmental League of Massachusetts, will also be on hand, said Josh Craft, a member of the steering committee for Cambridge-Somerville for Change.

The “Green Future 2020” event is co-sponsored by the City of Cambridge and Cambridge Climate Emergency Action Group. It is scheduled to be held at the Cambridge Senior Center, 806 Massachusetts Ave., Central Square, Cambridge, and preceded by a Wednesday event looking at how Portsmouth, N.H., became an “Eco-Municipality.” Details about the earlier event are here.