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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
62
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
2.05g CO2 per view
FIX
2.05g CO2 per view
Critical::
2.05g CO2 per page view
This page transfers 8.7 MB, producing an estimated 2.05g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.42g, end-user device 1.58g.
Got: 2.05g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 246.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 246.4 kg of CO2 annually — equivalent to charging 30799 smartphones.
Info::
Green hosting reduces data center emissions

2.05g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 8.7 MB

Your site
2.05g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.42g
End-user device
1.58g
At 10,000 monthly views: Monthly: 20.5 kg · Annual: 246.4 kg · ≈ 30799 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.05g 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

2.05g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 242% more
vs Target 311% more
B
Transfer Efficiency
90% efficient
REVIEW
90% efficient
Info::
Transfer efficiency: 90%
An estimated 928 KB (10%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 928 KB of unused JavaScript. This wasted data produces 0.21g of unnecessary CO2 per page view.
90% efficient

Total waste: 928 KB (10% of page weight)

Unused JS 928 KB

0.21g unnecessary CO2 per visit

Actual transfer 8883 KB
Theoretical minimum 7955 KB
Potential savings 928 KB (0.21g 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 43 KB (vs 8883 KB first visit). 79 of 82 resources are served from browser cache, saving 2.04g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 2.05g)
First visit
8883 KB
Repeat visit
43 KB

100% reduction on repeat visits

Saving 2.04g CO2 per returning visitor

79 resources served from cache · 3 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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