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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
80
GRADE
B
FIX
2
REVIEW
0
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 FIX
F
CO2 Per Page Load
Action
4.73g CO2 per view
FIX
4.73g CO2 per view
Critical::
4.73g CO2 per page view
This page transfers 20.0 MB, producing an estimated 4.73g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.12g, network 0.98g, end-user device 3.63g.
Got: 4.73g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 567.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 567.7 kg of CO2 annually — equivalent to charging 70965 smartphones.
Info::
Green hosting reduces data center emissions

4.73g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 20.0 MB

Your site
4.73g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.12g
Network
0.98g
End-user device
3.63g
At 10,000 monthly views: Monthly: 47.3 kg · Annual: 567.7 kg · ≈ 70965 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
4.73g 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

4.73g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 689% more
vs Target 846% 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 47 KB (vs 20468 KB first visit). 110 of 116 resources are served from browser cache, saving 4.72g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 4.73g)
First visit
20468 KB
Repeat visit
47 KB

100% reduction on repeat visits

Saving 4.72g CO2 per returning visitor

110 resources served from cache · 6 resources re-downloaded

A+
Transfer Efficiency
97% efficient
PASS
97% efficient
Info::
Transfer efficiency: 97%
Only 561 KB of potential savings identified. Your page is well-optimized for size.
97% efficient

Total waste: 561 KB (3% of page weight)

Unused JS 561 KB

0.13g unnecessary CO2 per visit

Actual transfer 20468 KB
Theoretical minimum 19906 KB
Potential savings 561 KB (0.13g 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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