Green campaigners say it is "a crime" that Newcastle is not doing more to tackle climate change.
Taymar Pitman, of the Newcastle Green Party, criticised the city council over its record on cutting carbon dioxide emissions.
At this week's full council meeting, she asked which of the 18 pledges made by the authority in 2010, which were intended to reduce the city's carbon emissions by 34% by 2020, have been achieved.
Coun Nick Kemp, cabinet member for environment, replied that CO2 emissions in the city have "reduced significantly", down 29% from 2005 to 2015.
However, he accepted that the council's climate change strategy needs updating this year and declined to provides updates on the 18 pledges because of the "significant time" it would take local authority officers to assess their progress.