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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
69
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
1.91g CO2 per view
FIX
1.91g CO2 per view
Warning::
1.91g CO2 per page view
This page transfers 8.1 MB, producing an estimated 1.91g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.40g, end-user device 1.47g.
Got: 1.91g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 229.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 229.6 kg of CO2 annually — equivalent to charging 28703 smartphones.
Info::
Green hosting reduces data center emissions

1.91g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 13% of websites

Sustainable Web Design model v4 · Page size: 8.1 MB

Your site
1.91g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.40g
End-user device
1.47g
At 10,000 monthly views: Monthly: 19.1 kg · Annual: 229.6 kg · ≈ 28703 smartphone charges
F
Carbon Budget
Action
87th percentile
FIX
87th percentile
Warning::
1.91g CO2 — above the median website (0.60g)
Heavier than an estimated 13% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 87th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.91g

87th percentile

Cleaner than 13% of websites

✗ Above the median website

vs Median 219% more
vs Target 283% 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 Not identified✗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 42 KB (vs 8278 KB first visit). 177 of 186 resources are served from browser cache, saving 1.90g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.91g)
First visit
8278 KB
Repeat visit
42 KB

99% reduction on repeat visits

Saving 1.90g CO2 per returning visitor

177 resources served from cache · 9 resources re-downloaded

A+
Transfer Efficiency
96% efficient
PASS
96% efficient
Info::
Transfer efficiency: 96%
Only 329 KB of potential savings identified. Your page is well-optimized for size.
96% efficient

Total waste: 329 KB (4% of page weight)

Unused JS 329 KB

0.08g unnecessary CO2 per visit

Actual transfer 8278 KB
Theoretical minimum 7949 KB
Potential savings 329 KB (0.08g 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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