We recognise the importance of continually reducing our environmental impact and we are only one of a small number of UK airports to have achieved level four-plus under the airport carbon accreditation programme.
That statement kind of contradicts their application to increase their emissions. They're basically saying "we're pretty low on emissions, we can get away with being worse".
Furthermore this Airport Carbon Accreditation seems to be about offsetting carbon emissions, primarily by planting trees. This is really a bit of a farce, as the trees being planted are almost always monoculture tree farms - they're setting up a profitable business to try and say that their polluting business isn't so bad overall. Meanwhile, monoculture tree farms are terrible for biodiversity.
The highest level of their accreditation, Level 5, only requires "a commitment" to reducing "non-controlled" emissions - ie those produced by aircraft - by 2050.