Isabelle Charles (left), Kate Jones -- both 6 -- and other members of the Park School Chorus practiced songs Wednesday for the 'One Earth, One Climate' rally, which will take place Saturday on Boston Common.
Isabelle Charles (left), Kate Jones -- both 6 -- and other members of the Park School Chorus practiced songs Wednesday for the "One Earth, One Climate" rally, which will take place Saturday on Boston Common.
(Globe Staff Photo / Evan Richman)