More than 85 people turned up for a rally against building on the green belt in Brockworth on Saturday.
Organised by Save Brockworth Green Belt, it was attended by fellow campaign groups and Tewkesbury MP Laurence Robertson.
It was organised to highlight the vital role the community can play in responding to the Joint Core Strategy.
Janet Thomas, of Save Brockworth Green Belt, said: "The JCS has identified sites which are suggested for inclusion in the strategy, for building over 33,000 houses in the next 20 years.
"Seven of the nine sites chosen by the JCS are on green belt land."
The rally was organised by Save Brockworth Green Belt and supported by nearly 90 people - local residents, Hashtag, Save our Stow, Save our Green Belt, Campaign to Protect Rural England, Laurence Robertson MP, Alistair Cameron, Liberal Democrat spokesman for Tewkesbury, and Brockworth Parish Councillors.
"The public can make a difference by responding to the public consultation," said Mrs Thomas.
"This is a draft consultation and can be modified and changed by public opinion.
"Green belt is at risk for no good reason. The population projections and housing need put forward by this particular document are flawed and greatly exaggerated.
"There is statistical evidence which shows that population growth within the next 20 years will be at least three times less than predicted by the JCS.
"There are also errors in the housing targets. The strategy is poor and needs to be reassessed.
"It is not a balanced plan and is weighted too much towards mass urban development using Green Belt. 19,000 houses are already in the pipeline and strategic sites which are not in the Green Belt are around but have been discounted by the JCS in favour of building on the green belt.
"There has been no traffic modelling as yet and no reference to phasing within the document, which could mean green belt land being developed before less sensitive areas. We urge people to send their response to the JCS.
"We would like to thank all those who have supported us. It was a great opportunity for the campaign groups to show a united front and get together for a common cause."
The Strategy is awaiting responses from the public and the closing date for any comments is December 13th