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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
65
GRADE
D
FIX
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.04g CO2 per view
FIX
1.04g CO2 per view
Warning::
1.04g CO2 per page view
This page transfers 4.4 MB, producing an estimated 1.04g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.21g, end-user device 0.80g.
Got: 1.04g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 124.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 124.5 kg of CO2 annually — equivalent to charging 15562 smartphones.
Info::
Green hosting reduces data center emissions

1.04g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 38% of websites

Sustainable Web Design model v4 · Page size: 4.4 MB

Your site
1.04g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.21g
End-user device
0.80g
At 10,000 monthly views: Monthly: 10.4 kg · Annual: 124.5 kg · ≈ 15562 smartphone charges
D
Carbon Budget
Action
62th percentile
FIX
62th percentile
Warning::
1.04g CO2 — above the median website (0.60g)
Heavier than an estimated 38% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 62th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.04g

62nd percentile

Cleaner than 38% of websites

✗ Above the median website

vs Median 73% more
vs Target 108% more
D
Transfer Efficiency
Action
58% efficient
FIX
58% efficient
Warning::
Transfer efficiency: 58%
An estimated 1881 KB (42%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1881 KB of unused JavaScript. This wasted data produces 0.43g of unnecessary CO2 per page view.
58% efficient

Total waste: 1881 KB (42% of page weight)

Unused JS 1881 KB

0.43g unnecessary CO2 per visit

Actual transfer 4488 KB
Theoretical minimum 2607 KB
Potential savings 1881 KB (0.43g 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 Next.js✗CDN Fastly✓

Fastly: 100% renewable energy for edge network

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 149 KB (vs 4488 KB first visit). 152 of 156 resources are served from browser cache, saving 1.00g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.04g)
First visit
4488 KB
Repeat visit
149 KB

97% reduction on repeat visits

Saving 1.00g CO2 per returning visitor

152 resources served from cache · 4 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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