By bizn_fun 
Sally Pavey, chair of CAGNE, said increased low-cost flights would export sterling from the UK economy and place an “unsustainable burden on the inadequate infrastructure”.
“The long-term effects of increased emissions on future generations and the planet cannot be addressed with aviation profits,” she added.
“This decision to allow Gatwick’s expansion makes no economic or ethical sense, so we must challenge it through the legal process.”
Gatwick’s is the latest in a string of UK airport expansion approvals, most recently Luton’s in April.
The government has said it backs a third runway at the country’s biggest airport, Heathrow.