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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
69
GRADE
D
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
F
CO2 Per Page Load
Action
1.57g CO2 per view
FIX
1.57g CO2 per view
Warning::
1.57g CO2 per page view
This page transfers 6.6 MB, producing an estimated 1.57g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.33g, end-user device 1.21g.
Got: 1.57g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 188.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 188.7 kg of CO2 annually — equivalent to charging 23586 smartphones.
Info::
Green hosting reduces data center emissions

1.57g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 23% of websites

Sustainable Web Design model v4 · Page size: 6.6 MB

Your site
1.57g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.33g
End-user device
1.21g
At 10,000 monthly views: Monthly: 15.7 kg · Annual: 188.7 kg · ≈ 23586 smartphone charges
F
Carbon Budget
Action
77th percentile
FIX
77th percentile
Warning::
1.57g CO2 — above the median website (0.60g)
Heavier than an estimated 23% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 77th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.57g

77th percentile

Cleaner than 23% of websites

✗ Above the median website

vs Median 162% more
vs Target 214% more
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 Pantheon✗CDN Fastly✓

Fastly: 100% renewable energy for edge network

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 43 KB (vs 6803 KB first visit). 154 of 155 resources are served from browser cache, saving 1.56g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.57g)
First visit
6803 KB
Repeat visit
43 KB

99% reduction on repeat visits

Saving 1.56g CO2 per returning visitor

154 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
94% efficient
PASS
94% efficient
Info::
Transfer efficiency: 94%
Only 374 KB of potential savings identified. Your page is well-optimized for size.
94% efficient

Total waste: 374 KB (6% of page weight)

Unused JS 374 KB

0.09g unnecessary CO2 per visit

Actual transfer 6803 KB
Theoretical minimum 6428 KB
Potential savings 374 KB (0.09g CO2)

See Deep Analysis sections above for specific optimizations.

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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