Robert Patterson is 74, a grandfather and yet has played a key role in pulling together a Melbourne Town Hall meeting for Saturday, September 9, which he hopes will prompt some grassroots climate action.

Mr Patterson has been deeply involved in the climate conversation for at least four years and with his group from Anakie, just north-west of Geelong, he helped set up the Letition idea.

Saturday's town hall meeting starts and one o'clock in the afternoon and will continue through to four - you can see the agenda and the fascinating array of powerful speakers on the attached "Stepping Up Together" meeting profile.