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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
72
GRADE
C
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
D
CO2 Per Page Load
Action
1.47g CO2 per view
FIX
1.47g CO2 per view
Warning::
1.47g CO2 per page view
This page transfers 6.2 MB, producing an estimated 1.47g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.30g, end-user device 1.13g.
Got: 1.47g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 176.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 176.5 kg of CO2 annually — equivalent to charging 22061 smartphones.
Info::
Green hosting reduces data center emissions

1.47g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 26% of websites

Sustainable Web Design model v4 · Page size: 6.2 MB

Your site
1.47g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.30g
End-user device
1.13g
At 10,000 monthly views: Monthly: 14.7 kg · Annual: 176.5 kg · ≈ 22061 smartphone charges
F
Carbon Budget
Action
74th percentile
FIX
74th percentile
Warning::
1.47g CO2 — above the median website (0.60g)
Heavier than an estimated 26% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 74th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.47g

74th percentile

Cleaner than 26% of websites

✗ Above the median website

vs Median 145% more
vs Target 194% more
B
Transfer Efficiency
80% efficient
REVIEW
80% efficient
Info::
Transfer efficiency: 80%
An estimated 1272 KB (20%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1272 KB of unused JavaScript. This wasted data produces 0.29g of unnecessary CO2 per page view.
80% efficient

Total waste: 1272 KB (20% of page weight)

Unused JS 1272 KB

0.29g unnecessary CO2 per visit

Actual transfer 6363 KB
Theoretical minimum 5090 KB
Potential savings 1272 KB (0.29g 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
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 255 KB (vs 6363 KB first visit). 401 of 413 resources are served from browser cache, saving 1.41g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 1.47g)
First visit
6363 KB
Repeat visit
255 KB

96% reduction on repeat visits

Saving 1.41g CO2 per returning visitor

401 resources served from cache · 12 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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