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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
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
F
CO2 Per Page Load
Action
2.72g CO2 per view
FIX
2.72g CO2 per view
Critical::
2.72g CO2 per page view
This page transfers 11.5 MB, producing an estimated 2.72g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.07g, network 0.56g, end-user device 2.09g.
Got: 2.72g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 326.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 326.8 kg of CO2 annually — equivalent to charging 40855 smartphones.
Info::
Green hosting reduces data center emissions

2.72g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 11.5 MB

Your site
2.72g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.07g
Network
0.56g
End-user device
2.09g
At 10,000 monthly views: Monthly: 27.2 kg · Annual: 326.8 kg · ≈ 40855 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.72g 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

2.72g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 354% more
vs Target 445% more
B
Transfer Efficiency
90% efficient
REVIEW
90% efficient
Info::
Transfer efficiency: 90%
An estimated 1225 KB (10%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1225 KB of unused JavaScript. This wasted data produces 0.28g of unnecessary CO2 per page view.
90% efficient

Total waste: 1225 KB (10% of page weight)

Unused JS 1225 KB

0.28g unnecessary CO2 per visit

Actual transfer 11783 KB
Theoretical minimum 10557 KB
Potential savings 1225 KB (0.28g CO2)

See Deep Analysis sections above for specific optimizations.

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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 149 KB (vs 11783 KB first visit). 179 of 182 resources are served from browser cache, saving 2.69g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 2.72g)
First visit
11783 KB
Repeat visit
149 KB

99% reduction on repeat visits

Saving 2.69g CO2 per returning visitor

179 resources served from cache · 3 resources re-downloaded

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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