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https://auckland.ac.nz

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
58
GRADE
D
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
F
CO2 Per Page Load
Action
2.78g CO2 per view
FIX
2.78g CO2 per view
Critical::
2.78g CO2 per page view
This page transfers 11.8 MB, producing an estimated 2.78g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.07g, network 0.58g, end-user device 2.14g.
Got: 2.78g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 334.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 334.1 kg of CO2 annually — equivalent to charging 41766 smartphones.
Info::
Green hosting reduces data center emissions

2.78g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 11.8 MB

Your site
2.78g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.07g
Network
0.58g
End-user device
2.14g
At 10,000 monthly views: Monthly: 27.8 kg · Annual: 334.1 kg · ≈ 41766 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.78g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

2.78g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 364% more
vs Target 457% more
C
Transfer Efficiency
Action
65% efficient
REVIEW
65% efficient
Warning::
Transfer efficiency: 65%
An estimated 4208 KB (35%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 4208 KB of unused JavaScript. This wasted data produces 0.97g of unnecessary CO2 per page view.
65% efficient

Total waste: 4208 KB (35% of page weight)

Unused JS 4208 KB

0.97g unnecessary CO2 per visit

Actual transfer 12046 KB
Theoretical minimum 7837 KB
Potential savings 4208 KB (0.97g CO2)

See Deep Analysis sections above for specific optimizations.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Fastly CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Fastly: 100% renewable energy for edge network
Info::
Green hosting status based on known provider commitments
Green hosting detection uses a curated database of provider renewable energy commitments. This is not a real-time verification. For authoritative checks, visit thegreenwebfoundation.org.
Green Hosting✓ Green Hosted
Hosting Not identified✗CDN Fastly✓

Fastly: 100% renewable energy for edge network

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 26 KB (vs 12046 KB first visit). 145 of 149 resources are served from browser cache, saving 2.78g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 2.78g)
First visit
12046 KB
Repeat visit
26 KB

100% reduction on repeat visits

Saving 2.78g CO2 per returning visitor

145 resources served from cache · 4 resources re-downloaded

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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