Christians from Christian Ecology Link joined a 'flashmob' at London Heathrow on Saturday 17 January 2009.
Hundreds of campaigners congregated in the Terminal 5 Departures area in response to the Government's recent announcement to support a third runway at the airport.
At 12 noon the campaigners revealed their red 'Stop Airport Expansion' T shirts and Christians knelt to pray in the hope that the runway ‘would not be built and that humans might learn to live lightly on God's Earth’ a statement said.
Christians around the UK supported the action by praying with the protestors at midday.
The Christians then joined with the other protestors in throwing red sponge balls at masks of the Transport Secretary, Geoff Hoon, and the Prime Minister, Gordon Brown, before dispersing peacefully.
Transport Secretary Geoff Hoon announced the government's decision on Thursday.
He said the business case for more capacity at the airport was compelling.
But Ruth Jarman, Trustee of Christian Ecology Link, said "In giving the go-ahead to this expansion the Government has chosen to lead the world towards climate meltdown, for purely short term economic growth.
"This blinkered focus on financial gain above all else is nothing short of idolatry, of which our Scriptures have a lot to say. We were there to speak against this madness and to pray for the success of the campaign to stop airport expansion in the UK".
The expansion has been criticised by other Christians including aid agency Christian Aid.
500 protesters took part in the hour-long protest.
Organisers included environmental and residents' groups, such as those from the village of Sipson, which will be flattened to make way for the runway.