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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
65
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
2.67g CO2 per view
FIX
2.67g CO2 per view
Critical::
2.67g CO2 per page view
This page transfers 11.3 MB, producing an estimated 2.67g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.07g, network 0.55g, end-user device 2.05g.
Got: 2.67g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 320.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 320.4 kg of CO2 annually — equivalent to charging 40051 smartphones.
Info::
Green hosting reduces data center emissions

2.67g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 11.3 MB

Your site
2.67g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.07g
Network
0.55g
End-user device
2.05g
At 10,000 monthly views: Monthly: 26.7 kg · Annual: 320.4 kg · ≈ 40051 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.67g 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

2.67g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 345% more
vs Target 434% more
B
Transfer Efficiency
88% efficient
REVIEW
88% efficient
Info::
Transfer efficiency: 88%
An estimated 1387 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1387 KB of unused JavaScript. This wasted data produces 0.32g of unnecessary CO2 per page view.
88% efficient

Total waste: 1387 KB (12% of page weight)

Unused JS 1387 KB

0.32g unnecessary CO2 per visit

Actual transfer 11551 KB
Theoretical minimum 10164 KB
Potential savings 1387 KB (0.32g 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: Amazon Web Services, CDN: Cloudflare
Info::
Amazon Web Services: 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 Amazon Web Services✓CDN Cloudflare✓

Amazon Web Services: 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 172 KB (vs 11551 KB first visit). 331 of 338 resources are served from browser cache, saving 2.63g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 2.67g)
First visit
11551 KB
Repeat visit
172 KB

99% reduction on repeat visits

Saving 2.63g CO2 per returning visitor

331 resources served from cache · 7 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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