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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
77
GRADE
C
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
1.80g CO2 per view
FIX
1.80g CO2 per view
Warning::
1.80g CO2 per page view
This page transfers 7.6 MB, producing an estimated 1.80g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.37g, end-user device 1.39g.
Got: 1.80g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 216.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 216.5 kg of CO2 annually — equivalent to charging 27062 smartphones.
Info::
Green hosting reduces data center emissions

1.80g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 16% of websites

Sustainable Web Design model v4 · Page size: 7.6 MB

Your site
1.80g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.37g
End-user device
1.39g
At 10,000 monthly views: Monthly: 18.0 kg · Annual: 216.5 kg · ≈ 27062 smartphone charges
F
Carbon Budget
Action
84th percentile
FIX
84th percentile
Warning::
1.80g CO2 — above the median website (0.60g)
Heavier than an estimated 16% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 84th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.80g

84th percentile

Cleaner than 16% of websites

✗ Above the median website

vs Median 201% more
vs Target 261% 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 Not identified✗CDN Fastly✓

Fastly: 100% renewable energy for edge network

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 124 KB (vs 7805 KB first visit). 343 of 345 resources are served from browser cache, saving 1.78g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.80g)
First visit
7805 KB
Repeat visit
124 KB

98% reduction on repeat visits

Saving 1.78g CO2 per returning visitor

343 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 420 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 420 KB (5% of page weight)

Unused JS 420 KB

0.10g unnecessary CO2 per visit

Actual transfer 7805 KB
Theoretical minimum 7385 KB
Potential savings 420 KB (0.10g 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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