Protesters have taken to Heathrow to demonstrate against any airport expansion and additional runways in the UK.
Campaigning group Reclaim the Power, which organised the protest, says that plans for a new runway are "devastating for local air quality and for climate change."
Cyclists dressed in red stood in a line to mark "a red line - airport expansion is a line that must not be crossed to stop climate change".
Additionally, protesters staged a 'die in' inside the airport, where they lay on the floor as busy travelers moved around them.
A Heathrow spokesman said: "This is a very small minority of people protesting about aviation in general and attempting to disrupt ordinary people as they go about their day-to-day lives.
"Heathrow expansion is not a choice between delivering for the economy and protecting the environment - we can do both.
"Independent analysis by the Airports Commission has found that building and operating an additional runway at Heathrow is compatible with the UK meeting its long-term climate change reduction targets."