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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
63
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
5.76g CO2 per view
FIX
5.76g CO2 per view
Critical::
5.76g CO2 per page view
This page transfers 24.3 MB, producing an estimated 5.76g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.14g, network 1.19g, end-user device 4.43g.
Got: 5.76g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 691.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 691.3 kg of CO2 annually — equivalent to charging 86414 smartphones.
Info::
Green hosting reduces data center emissions

5.76g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 24.3 MB

Your site
5.76g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.14g
Network
1.19g
End-user device
4.43g
At 10,000 monthly views: Monthly: 57.6 kg · Annual: 691.3 kg · ≈ 86414 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
5.76g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

5.76g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 860% more
vs Target 1052% 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 Snowplow Analytics✗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 197 KB (vs 24924 KB first visit). 290 of 306 resources are served from browser cache, saving 5.72g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 5.76g)
First visit
24924 KB
Repeat visit
197 KB

99% reduction on repeat visits

Saving 5.72g CO2 per returning visitor

290 resources served from cache · 16 resources re-downloaded

A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 2081 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 2081 KB (8% of page weight)

Unused JS 2081 KB

0.48g unnecessary CO2 per visit

Actual transfer 24924 KB
Theoretical minimum 22842 KB
Potential savings 2081 KB (0.48g 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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