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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
2.35g CO2 per view
FIX
2.35g CO2 per view
Critical::
2.35g CO2 per page view
This page transfers 9.9 MB, producing an estimated 2.35g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.06g, network 0.49g, end-user device 1.81g.
Got: 2.35g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 282.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 282.0 kg of CO2 annually — equivalent to charging 35248 smartphones.
Info::
Green hosting reduces data center emissions

2.35g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 9.9 MB

Your site
2.35g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.06g
Network
0.49g
End-user device
1.81g
At 10,000 monthly views: Monthly: 23.5 kg · Annual: 282.0 kg · ≈ 35248 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.35g 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

2.35g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 292% more
vs Target 370% more
B
Transfer Efficiency
87% efficient
REVIEW
87% efficient
Info::
Transfer efficiency: 87%
An estimated 1353 KB (13%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1353 KB of unused JavaScript. This wasted data produces 0.31g of unnecessary CO2 per page view.
87% efficient

Total waste: 1353 KB (13% of page weight)

Unused JS 1353 KB

0.31g unnecessary CO2 per visit

Actual transfer 10166 KB
Theoretical minimum 8812 KB
Potential savings 1353 KB (0.31g 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 87 KB (vs 10166 KB first visit). 85 of 87 resources are served from browser cache, saving 2.33g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 2.35g)
First visit
10166 KB
Repeat visit
87 KB

99% reduction on repeat visits

Saving 2.33g CO2 per returning visitor

85 resources served from cache · 2 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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