Climate activists from Extinction Rebellion have drawn up plans to use drones to shut London's Heathrow Airport this summer in a campaign to stop the construction of a third runway at Europe's busiest airport, the group said.

The internal proposal, seen by Reuters, emerged against a backdrop of renewed campaigning by environmental groups who argue that expanding Heathrow would be incompatible with Britain's targets to curb greenhouse gas emissions.

"On June 18, we plan to carry out nonviolent direct action to ensure Heathrow Authorities close the airport for the day, to create a 'pause' in recognition of the genocidal impact of high carbon activities, such as flying, upon the natural world," Extinction Rebellion said in a statement late on Thursday.