Tonight at the Friends Meeting House on Gloucester Road, there is a Climate Change City-Wide meeting with the following speakers:
Charlie Bolton (Green Party Councillor)
Elaine Graham-Leigh (Respect)
Mark Plummer (Climate Change Campaign)
Ian Ross Dept of Geographical Sciences (University of Bristol)

I can't find a URL specifically for this event but 2 of the groups who have a speaker, mentions a little info at the following addresses:
Climate Change Campaign
Bristol Green Party