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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
68
GRADE
D
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
1.38g CO2 per view
FIX
1.38g CO2 per view
Warning::
1.38g CO2 per page view
This page transfers 5.8 MB, producing an estimated 1.38g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.29g, end-user device 1.06g.
Got: 1.38g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 165.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 165.9 kg of CO2 annually — equivalent to charging 20736 smartphones.
Info::
Green hosting reduces data center emissions

1.38g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 28% of websites

Sustainable Web Design model v4 · Page size: 5.8 MB

Your site
1.38g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.29g
End-user device
1.06g
At 10,000 monthly views: Monthly: 13.8 kg · Annual: 165.9 kg · ≈ 20736 smartphone charges
F
Carbon Budget
Action
72th percentile
FIX
72th percentile
Warning::
1.38g CO2 — above the median website (0.60g)
Heavier than an estimated 28% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 72th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.38g

72nd percentile

Cleaner than 28% of websites

✗ Above the median website

vs Median 130% more
vs Target 176% more
C
Transfer Efficiency
Action
68% efficient
REVIEW
68% efficient
Warning::
Transfer efficiency: 68%
An estimated 1916 KB (32%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1916 KB of unused JavaScript. This wasted data produces 0.44g of unnecessary CO2 per page view.
68% efficient

Total waste: 1916 KB (32% of page weight)

Unused JS 1916 KB

0.44g unnecessary CO2 per visit

Actual transfer 5981 KB
Theoretical minimum 4064 KB
Potential savings 1916 KB (0.44g 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
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 111 KB (vs 5981 KB first visit). 251 of 256 resources are served from browser cache, saving 1.36g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.38g)
First visit
5981 KB
Repeat visit
111 KB

98% reduction on repeat visits

Saving 1.36g CO2 per returning visitor

251 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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