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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
2.15g CO2 per view
FIX
2.15g CO2 per view
Critical::
2.15g CO2 per page view
This page transfers 9.1 MB, producing an estimated 2.15g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.44g, end-user device 1.65g.
Got: 2.15g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 258.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 258.2 kg of CO2 annually — equivalent to charging 32270 smartphones.
Info::
Green hosting reduces data center emissions

2.15g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 9.1 MB

Your site
2.15g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.44g
End-user device
1.65g
At 10,000 monthly views: Monthly: 21.5 kg · Annual: 258.2 kg · ≈ 32270 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.15g 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

2.15g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 259% more
vs Target 330% more
B
Transfer Efficiency
76% efficient
REVIEW
76% efficient
Info::
Transfer efficiency: 76%
An estimated 2261 KB (24%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2261 KB of unused JavaScript. This wasted data produces 0.52g of unnecessary CO2 per page view.
76% efficient

Total waste: 2261 KB (24% of page weight)

Unused JS 2261 KB

0.52g unnecessary CO2 per visit

Actual transfer 9307 KB
Theoretical minimum 7046 KB
Potential savings 2261 KB (0.52g 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
92% cached
PASS
92% cached
Info::
92% reduction on repeat visits
Returning visitors download only 704 KB (vs 9307 KB first visit). 307 of 324 resources are served from browser cache, saving 1.99g CO2 per repeat visit.
Info::
Repeat visit: 0.16g CO2 (first visit: 2.15g)
First visit
9307 KB
Repeat visit
704 KB

92% reduction on repeat visits

Saving 1.99g CO2 per returning visitor

307 resources served from cache · 17 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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