Monday Essentials: Nature Walk, Energy Meeting

See what's happening in Waltham during the week of Jan. 6.

-A nature walk will be held on Jan. 9 at Beaver Brook Reservation at 10 a.m. 

-The Waltham Energy Action Committee will meet on Jan. 9 at 7 p.m. at 119 School St.

-The Zoning Board of Appeals will meet at 7 p.m.