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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
63
GRADE
D
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
F
CO2 Per Page Load
Action
7.33g CO2 per view
FIX
7.33g CO2 per view
Critical::
7.33g CO2 per page view
This page transfers 31.0 MB, producing an estimated 7.33g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.18g, network 1.52g, end-user device 5.63g.
Got: 7.33g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 879.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 879.1 kg of CO2 annually — equivalent to charging 109889 smartphones.
Info::
Green hosting reduces data center emissions

7.33g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 31.0 MB

Your site
7.33g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.18g
Network
1.52g
End-user device
5.63g
At 10,000 monthly views: Monthly: 73.3 kg · Annual: 879.1 kg · ≈ 109889 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
7.33g 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

7.33g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 1121% more
vs Target 1365% more
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 259 KB (vs 31694 KB first visit). 183 of 187 resources are served from browser cache, saving 7.27g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 7.33g)
First visit
31694 KB
Repeat visit
259 KB

99% reduction on repeat visits

Saving 7.27g CO2 per returning visitor

183 resources served from cache · 4 resources re-downloaded

A+
Transfer Efficiency
98% efficient
PASS
98% efficient
Info::
Transfer efficiency: 98%
Only 713 KB of potential savings identified. Your page is well-optimized for size.
98% efficient

Total waste: 713 KB (2% of page weight)

Unused JS 713 KB

0.16g unnecessary CO2 per visit

Actual transfer 31694 KB
Theoretical minimum 30981 KB
Potential savings 713 KB (0.16g CO2)

See Deep Analysis sections above for specific optimizations.

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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