Climate Home: Details of a global carbon offsetting scheme for planes are up in the air after an inconclusive meeting in Montreal last week.
With four months until the International Civil Aviation Organization aims to finalise a deal, major uncertainties remain on its environmental integrity.
A proposal by Singapore to introduce a pre-implementation phase had campaigners worried action on a growing source of greenhouse gas emissions could be delayed.
It is injecting a lot of confusion, Brad Schallert...