Tree Canopy Coverage

A University of Southampton study reports that the 929 hectares of Southampton’s trees sequestre 2684 tonnes of CO2 annually. [https://eprints.soton.ac.uk/415849/2/Soton_i_Tree_report_final_v2.pdf page 7]

This equates to 2.89 tonnes per hectare for the type and age of tree found in Southampton [note the 534 kg/hectare in the article refers to the number of hectares of Southampton that were studied {5019 hectares}, not the area covered by trees {929 hectares}.

Eastleigh’s tree coverage is estimated as 22%

[https://www.researchgate.net/publication/322337570_The_Canopy_Cover_of_England’s_Towns_and_Cities_baselining_and_setting_targets_to_improve_human_health_and_well-being]

Eastleigh BC’s total area is 7977.8 hectares [https://www.eastleigh.gov.uk/media/1762/eb-profile-partc-environment.pdf]

Therefore the area of Eastleigh covered by Trees is 1755.12 hectares, which absorbs 5072.3 tonnes per year.

The average emissions from the development is 350,000 tonnes/year over the project lifespan. Therefore Eastleigh needs at least 65 times as many trees as it has to make the development sustainable.

121,107 hectares of similar age/density trees would be needed to absorb 350,000 tonnes CO2 annually. This total tree canopy coverage is at least 3 times the area of Hampshire.

This is roughly equivalent to 1000 times the area of Southampton airport.

Alternatively:

  1. One large protected sapling could be planted just where the runway extension is proposed.
  2. The Councillors on Eastleigh Local Area Committee could refuse the application to expand Southampton airport.

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