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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
63
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
3.79g CO2 per view
FIX
3.79g CO2 per view
Critical::
3.79g CO2 per page view
This page transfers 16.0 MB, producing an estimated 3.79g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.09g, network 0.78g, end-user device 2.91g.
Got: 3.79g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 454.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 454.6 kg of CO2 annually — equivalent to charging 56820 smartphones.
Info::
Green hosting reduces data center emissions

3.79g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 16.0 MB

Your site
3.79g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.09g
Network
0.78g
End-user device
2.91g
At 10,000 monthly views: Monthly: 37.9 kg · Annual: 454.6 kg · ≈ 56820 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
3.79g 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

3.79g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 531% more
vs Target 658% more
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Cloudflare CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
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 Not identified✗CDN Cloudflare✓

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 25 KB (vs 16388 KB first visit). 98 of 100 resources are served from browser cache, saving 3.78g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 3.79g)
First visit
16388 KB
Repeat visit
25 KB

100% reduction on repeat visits

Saving 3.78g CO2 per returning visitor

98 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
97% efficient
PASS
97% efficient
Info::
Transfer efficiency: 97%
Only 544 KB of potential savings identified. Your page is well-optimized for size.
97% efficient

Total waste: 544 KB (3% of page weight)

Unused JS 544 KB

0.13g unnecessary CO2 per visit

Actual transfer 16388 KB
Theoretical minimum 15844 KB
Potential savings 544 KB (0.13g CO2)

See Deep Analysis sections above for specific optimizations.

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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