Climate advisers say a proposed Heathrow expansion cannot proceed unless the aviation sector significantly cuts its emissions. The Evening Standard reports that the Climate Change Committee links any expansion to stronger measures to reduce the carbon impact of international flights.

The reporting highlights that emissions-reduction actions could affect flight costs over time. The Climate Change Committee warns that the cost of international air travel might need to rise substantially—potentially by hundreds of pounds by 2050—to fund measures that reduce emissions.

Across the two sources provided, the common thrust is that aviation growth and infrastructure plans are constrained by the need to meet emissions targets. While the Evening Standard specifies the nature of the warning—emphasising the requirement to cut flying emissions and the possible long-term cost implications—Yahoo UK News does not include additional detail in the text supplied here, limiting further comparison of angles.