BBC: Sixty climate campaigners have held a picnic in the check-in hall at Leeds Bradford Airport in a protest over its planned expansion. The airport wants to build a £28m two-storey extension to the terminal building which would house an improved check-in area and departure lounge. Campaigners say the plan will cause an increase in greenhouse gas emissions. The airport has said it planned to “improve and refine” its method of monitoring air quality. Protesters ate …