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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
73
GRADE
C
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
D
CO2 Per Page Load
Action
0.85g CO2 per view
FIX
0.85g CO2 per view
Info::
0.85g CO2 per page view
This page transfers 3.6 MB, producing an estimated 0.85g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.17g, end-user device 0.65g.
Got: 0.85g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 101.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 101.5 kg of CO2 annually — equivalent to charging 12683 smartphones.
Info::
Green hosting reduces data center emissions

0.85g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 43% of websites

Sustainable Web Design model v4 · Page size: 3.6 MB

Your site
0.85g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.17g
End-user device
0.65g
At 10,000 monthly views: Monthly: 8.5 kg · Annual: 101.5 kg · ≈ 12683 smartphone charges
D
Carbon Budget
Action
57th percentile
FIX
57th percentile
Warning::
0.85g CO2 — above the median website (0.60g)
Heavier than an estimated 43% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 57th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.85g

57th percentile

Cleaner than 43% of websites

✗ Above the median website

vs Median 41% more
vs Target 69% more
B
Transfer Efficiency
86% efficient
REVIEW
86% efficient
Info::
Transfer efficiency: 86%
An estimated 518 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 518 KB of unused JavaScript. This wasted data produces 0.12g of unnecessary CO2 per page view.
86% efficient

Total waste: 518 KB (14% of page weight)

Unused JS 518 KB

0.12g unnecessary CO2 per visit

Actual transfer 3658 KB
Theoretical minimum 3140 KB
Potential savings 518 KB (0.12g 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::
Cloudflare CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Cloudflare✓

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 171 KB (vs 3658 KB first visit). 111 of 113 resources are served from browser cache, saving 0.81g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 0.85g)
First visit
3658 KB
Repeat visit
171 KB

95% reduction on repeat visits

Saving 0.81g CO2 per returning visitor

111 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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