Biodiversity Net Gain, Dr Julia Baker
In practice?
Check LPA requirements
Use the metric as early as possible! Clearly state assumptions then ground-truth later
Habitat map
Avoid & Reduce
Design innovations to avoid impacts -
Set BNG as a core deliverable from the start Use the metric as a decision-making tool Involve Contractors early
Biodiversity Net Gain? • More or better habitats • Space
Small changes can get big results
Do Nothing for BNG - Retained habitat (good) - But no enhancement - Ornamental planting Net loss 8%
Do Something for BNG - Enhance retained habitat - Ecological rich habitats in undisturbed areas - Native planting Net gain 12%
Do Nothing • Amenity wet grassland mix • -8.5% units
Do Something • Native species rich grassland mix • +5% units • No extra cost
10%
It’s not all about units It’s also about cover
Check local biodiversity strategies as these often refer to habitat cover
10%
It’s not all about 10% It’s also about wildlife
Woodland creation = 100 units * 1.1 = 110
Net Gains for bats
Challenges? • Demonstrate mitigation hierarchy
• Grassland gains mask woodland losses • Unfeasible BNG designs • Space for habitats
The future? • Mandatory BNG
• Covid19 shown the great value of green spaces • BNG will underpin genuine sustainable development