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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
69
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
1.83g CO2 per view
FIX
1.83g CO2 per view
Warning::
1.83g CO2 per page view
This page transfers 7.7 MB, producing an estimated 1.83g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.38g, end-user device 1.40g.
Got: 1.83g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 219.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 219.2 kg of CO2 annually — equivalent to charging 27404 smartphones.
Info::
Green hosting reduces data center emissions

1.83g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 15% of websites

Sustainable Web Design model v4 · Page size: 7.7 MB

Your site
1.83g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.38g
End-user device
1.40g
At 10,000 monthly views: Monthly: 18.3 kg · Annual: 219.2 kg · ≈ 27404 smartphone charges
F
Carbon Budget
Action
85th percentile
FIX
85th percentile
Warning::
1.83g CO2 — above the median website (0.60g)
Heavier than an estimated 15% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 85th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.83g

85th percentile

Cleaner than 15% of websites

✗ Above the median website

vs Median 204% more
vs Target 265% 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
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 137 KB (vs 7904 KB first visit). 77 of 80 resources are served from browser cache, saving 1.80g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.83g)
First visit
7904 KB
Repeat visit
137 KB

98% reduction on repeat visits

Saving 1.80g CO2 per returning visitor

77 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
96% efficient
PASS
96% efficient
Info::
Transfer efficiency: 96%
Only 346 KB of potential savings identified. Your page is well-optimized for size.
96% efficient

Total waste: 346 KB (4% of page weight)

Unused JS 346 KB

0.08g unnecessary CO2 per visit

Actual transfer 7904 KB
Theoretical minimum 7557 KB
Potential savings 346 KB (0.08g 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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