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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
64
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
2.09g CO2 per view
FIX
2.09g CO2 per view
Critical::
2.09g CO2 per page view
This page transfers 8.8 MB, producing an estimated 2.09g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.43g, end-user device 1.61g.
Got: 2.09g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 251.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 251.0 kg of CO2 annually — equivalent to charging 31369 smartphones.
Info::
Green hosting reduces data center emissions

2.09g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 8.8 MB

Your site
2.09g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.43g
End-user device
1.61g
At 10,000 monthly views: Monthly: 20.9 kg · Annual: 251.0 kg · ≈ 31369 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.09g 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

2.09g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 249% more
vs Target 318% more
C
Transfer Efficiency
Action
68% efficient
REVIEW
68% efficient
Warning::
Transfer efficiency: 68%
An estimated 2908 KB (32%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2908 KB of unused JavaScript. This wasted data produces 0.67g of unnecessary CO2 per page view.
68% efficient

Total waste: 2908 KB (32% of page weight)

Unused JS 2908 KB

0.67g unnecessary CO2 per visit

Actual transfer 9047 KB
Theoretical minimum 6139 KB
Potential savings 2908 KB (0.67g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: Verified by the Green Web Foundation
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 Cloudflare✓CDN Cloudflare✓

Cloudflare: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

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 82 KB (vs 9047 KB first visit). 187 of 192 resources are served from browser cache, saving 2.07g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 2.09g)
First visit
9047 KB
Repeat visit
82 KB

99% reduction on repeat visits

Saving 2.07g CO2 per returning visitor

187 resources served from cache · 5 resources re-downloaded

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

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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