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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
0
REVIEW
4
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 4 REVIEW
B
CO2 Per Page Load
0.58g CO2 per view
REVIEW
0.58g CO2 per view
Info::
0.58g CO2 per page view
This page transfers 2.5 MB, producing an estimated 0.58g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.12g, end-user device 0.45g.
Got: 0.58g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 69.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 69.6 kg of CO2 annually — equivalent to charging 8703 smartphones.
Info::
Green hosting reduces data center emissions

0.58g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 52% of websites

Sustainable Web Design model v4 · Page size: 2.5 MB

Your site
0.58g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.12g
End-user device
0.45g
At 10,000 monthly views: Monthly: 5.8 kg · Annual: 69.6 kg · ≈ 8703 smartphone charges
B
Carbon Budget
48th percentile
REVIEW
48th percentile
Info::
0.58g CO2 — below the median website (0.60g)
Better than an estimated 52% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 48th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.58g

48th percentile

Cleaner than 52% of websites

✗ Above the median website

vs Median 3% cleaner ✓
vs Target 16% more
B
Transfer Efficiency
83% efficient
REVIEW
83% efficient
Info::
Transfer efficiency: 83%
An estimated 436 KB (17%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 436 KB of unused JavaScript. This wasted data produces 0.10g of unnecessary CO2 per page view.
83% efficient

Total waste: 436 KB (17% of page weight)

Unused JS 436 KB

0.10g unnecessary CO2 per visit

Actual transfer 2510 KB
Theoretical minimum 2074 KB
Potential savings 436 KB (0.10g 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
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 96 KB (vs 2510 KB first visit). 312 of 313 resources are served from browser cache, saving 0.56g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.58g)
First visit
2510 KB
Repeat visit
96 KB

96% reduction on repeat visits

Saving 0.56g CO2 per returning visitor

312 resources served from cache · 1 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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