A film has been made to highlight the loss of thousands of firefighters' jobs, station closures and reduction in fire engines.
The Fire Brigades Union (FBU) said the aim of its venture was to press the Government to set national standards to improve emergency response times.
The film, The Firefighters' Dilemma, shows a pensioner trapped in a burning flat, with delays to some crews arriving to fight the blaze.
The union said emergency response times are at their slowest in two decades due to fire station closures, 10,000 frontline firefighter job-losses and the removal of scores of fire engines from service.
FBU general secretary Matt Wrack said: "The public need to be made aware that lives are being lost as a direct result of slowing emergency response times.
"We want this hard-hitting film to be shared as widely as possible to spread the message that vulnerable people are being put at serious risk by the late arrival of fire crews.
"These potentially catastrophic failures put firefighters under incredible strain and we are seeing a resultant increase in stress and mental health problems among our members.
"Firefighters being firefighters, they do sometimes go in even when there isn't backup, so slowing response times are putting their safety at risk as well."
The union has also launched a petition to urge the Government to act.