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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
81
GRADE
B
FIX
1
REVIEW
3
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 3 REVIEW 1 FIX
D
Carbon Budget
Action
51th percentile
FIX
51th percentile
Warning::
0.66g CO2 — above the median website (0.60g)
Heavier than an estimated 49% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 51th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.66g

51st percentile

Cleaner than 49% of websites

✗ Above the median website

vs Median 10% more
vs Target 32% more
B
CO2 Per Page Load
0.66g CO2 per view
REVIEW
0.66g CO2 per view
Info::
0.66g CO2 per page view
This page transfers 2.8 MB, producing an estimated 0.66g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.14g, end-user device 0.51g.
Got: 0.66g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 79.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 79.1 kg of CO2 annually — equivalent to charging 9881 smartphones.
Info::
Green hosting reduces data center emissions

0.66g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 49% of websites

Sustainable Web Design model v4 · Page size: 2.8 MB

Your site
0.66g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.14g
End-user device
0.51g
At 10,000 monthly views: Monthly: 6.6 kg · Annual: 79.1 kg · ≈ 9881 smartphone charges
B
Transfer Efficiency
79% efficient
REVIEW
79% efficient
Info::
Transfer efficiency: 79%
An estimated 606 KB (21%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 606 KB of unused JavaScript. This wasted data produces 0.14g of unnecessary CO2 per page view.
79% efficient

Total waste: 606 KB (21% of page weight)

Unused JS 606 KB

0.14g unnecessary CO2 per visit

Actual transfer 2850 KB
Theoretical minimum 2243 KB
Potential savings 606 KB (0.14g 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::
Fastly CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Fastly: 100% renewable energy for edge network
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 Fastly✓

Fastly: 100% renewable energy for edge network

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
91% cached
PASS
91% cached
Info::
91% reduction on repeat visits
Returning visitors download only 258 KB (vs 2850 KB first visit). 120 of 122 resources are served from browser cache, saving 0.60g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 0.66g)
First visit
2850 KB
Repeat visit
258 KB

91% reduction on repeat visits

Saving 0.60g CO2 per returning visitor

120 resources served from cache · 2 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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