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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
65
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
1.85g CO2 per view
FIX
1.85g CO2 per view
Warning::
1.85g CO2 per page view
This page transfers 7.8 MB, producing an estimated 1.85g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.38g, end-user device 1.42g.
Got: 1.85g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 222.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 222.2 kg of CO2 annually — equivalent to charging 27771 smartphones.
Info::
Green hosting reduces data center emissions

1.85g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 15% of websites

Sustainable Web Design model v4 · Page size: 7.8 MB

Your site
1.85g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.38g
End-user device
1.42g
At 10,000 monthly views: Monthly: 18.5 kg · Annual: 222.2 kg · ≈ 27771 smartphone charges
F
Carbon Budget
Action
85th percentile
FIX
85th percentile
Warning::
1.85g CO2 — above the median website (0.60g)
Heavier than an estimated 15% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 85th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.85g

85th percentile

Cleaner than 15% of websites

✗ Above the median website

vs Median 209% more
vs Target 270% more
B
Transfer Efficiency
88% efficient
REVIEW
88% efficient
Info::
Transfer efficiency: 88%
An estimated 974 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 974 KB of unused JavaScript. This wasted data produces 0.23g of unnecessary CO2 per page view.
88% efficient

Total waste: 974 KB (12% of page weight)

Unused JS 974 KB

0.23g unnecessary CO2 per visit

Actual transfer 8010 KB
Theoretical minimum 7035 KB
Potential savings 974 KB (0.23g 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 Pantheon✗CDN Fastly✓

Fastly: 100% renewable energy for edge network

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 88 KB (vs 8010 KB first visit). 152 of 154 resources are served from browser cache, saving 1.83g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.85g)
First visit
8010 KB
Repeat visit
88 KB

99% reduction on repeat visits

Saving 1.83g CO2 per returning visitor

152 resources served from cache · 2 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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