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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
3.78g CO2 per view
FIX
3.78g CO2 per view
Critical::
3.78g CO2 per page view
This page transfers 16.0 MB, producing an estimated 3.78g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.09g, network 0.78g, end-user device 2.90g.
Got: 3.78g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 453.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 453.5 kg of CO2 annually — equivalent to charging 56683 smartphones.
Info::
Green hosting reduces data center emissions

3.78g

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
3.78g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.09g
Network
0.78g
End-user device
2.90g
At 10,000 monthly views: Monthly: 37.8 kg · Annual: 453.5 kg · ≈ 56683 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
3.78g 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

3.78g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 530% more
vs Target 656% 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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 130 KB (vs 16349 KB first visit). 153 of 158 resources are served from browser cache, saving 3.75g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 3.78g)
First visit
16349 KB
Repeat visit
130 KB

99% reduction on repeat visits

Saving 3.75g CO2 per returning visitor

153 resources served from cache · 5 resources re-downloaded

A+
Transfer Efficiency
97% efficient
PASS
97% efficient
Info::
Transfer efficiency: 97%
Only 558 KB of potential savings identified. Your page is well-optimized for size.
97% efficient

Total waste: 558 KB (3% of page weight)

Unused JS 558 KB

0.13g unnecessary CO2 per visit

Actual transfer 16349 KB
Theoretical minimum 15790 KB
Potential savings 558 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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