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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
4.16g CO2 per view
FIX
4.16g CO2 per view
Critical::
4.16g CO2 per page view
This page transfers 17.6 MB, producing an estimated 4.16g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.10g, network 0.86g, end-user device 3.20g.
Got: 4.16g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 499.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 499.6 kg of CO2 annually — equivalent to charging 62451 smartphones.
Info::
Green hosting reduces data center emissions

4.16g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 17.6 MB

Your site
4.16g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.10g
Network
0.86g
End-user device
3.20g
At 10,000 monthly views: Monthly: 41.6 kg · Annual: 499.6 kg · ≈ 62451 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
4.16g 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

4.16g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 594% more
vs Target 733% 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::
AWS: Renewable energy varies by region; committed to 100% by 2025
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 AWS✗CDN Cloudflare✓

AWS: Renewable energy varies by region; committed to 100% by 2025

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 99 KB (vs 18012 KB first visit). 135 of 141 resources are served from browser cache, saving 4.14g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 4.16g)
First visit
18012 KB
Repeat visit
99 KB

99% reduction on repeat visits

Saving 4.14g CO2 per returning visitor

135 resources served from cache · 6 resources re-downloaded

A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 1481 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 1481 KB (8% of page weight)

Unused JS 1481 KB

0.34g unnecessary CO2 per visit

Actual transfer 18012 KB
Theoretical minimum 16530 KB
Potential savings 1481 KB (0.34g 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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