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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
66
GRADE
D
FIX
2
REVIEW
0
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 FIX
F
CO2 Per Page Load
Action
4.63g CO2 per view
FIX
4.63g CO2 per view
Critical::
4.63g CO2 per page view
This page transfers 19.6 MB, producing an estimated 4.63g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.12g, network 0.96g, end-user device 3.56g.
Got: 4.63g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 555.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 555.8 kg of CO2 annually — equivalent to charging 69471 smartphones.
Info::
Green hosting reduces data center emissions

4.63g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 19.6 MB

Your site
4.63g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.12g
Network
0.96g
End-user device
3.56g
At 10,000 monthly views: Monthly: 46.3 kg · Annual: 555.8 kg · ≈ 69471 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
4.63g 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

4.63g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 672% more
vs Target 826% more
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 484 KB (vs 20037 KB first visit). 247 of 259 resources are served from browser cache, saving 4.52g CO2 per repeat visit.
Info::
Repeat visit: 0.11g CO2 (first visit: 4.63g)
First visit
20037 KB
Repeat visit
484 KB

98% reduction on repeat visits

Saving 4.52g CO2 per returning visitor

247 resources served from cache · 12 resources re-downloaded

A+
Transfer Efficiency
98% efficient
PASS
98% efficient
Info::
Transfer efficiency: 98%
Only 377 KB of potential savings identified. Your page is well-optimized for size.
98% efficient

Total waste: 377 KB (2% of page weight)

Unused JS 377 KB

0.09g unnecessary CO2 per visit

Actual transfer 20037 KB
Theoretical minimum 19659 KB
Potential savings 377 KB (0.09g CO2)

See Deep Analysis sections above for specific optimizations.

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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