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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
8.13g CO2 per view
FIX
8.13g CO2 per view
Critical::
8.13g CO2 per page view
This page transfers 34.4 MB, producing an estimated 8.13g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.20g, network 1.68g, end-user device 6.25g.
Got: 8.13g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 975.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 975.8 kg of CO2 annually — equivalent to charging 121976 smartphones.
Info::
Green hosting reduces data center emissions

8.13g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 34.4 MB

Your site
8.13g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.20g
Network
1.68g
End-user device
6.25g
At 10,000 monthly views: Monthly: 81.3 kg · Annual: 975.8 kg · ≈ 121976 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
8.13g 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

8.13g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 1255% more
vs Target 1526% 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 196 KB (vs 35180 KB first visit). 289 of 305 resources are served from browser cache, saving 8.09g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 8.13g)
First visit
35180 KB
Repeat visit
196 KB

99% reduction on repeat visits

Saving 8.09g CO2 per returning visitor

289 resources served from cache · 16 resources re-downloaded

A+
Transfer Efficiency
94% efficient
PASS
94% efficient
Info::
Transfer efficiency: 94%
Only 2069 KB of potential savings identified. Your page is well-optimized for size.
94% efficient

Total waste: 2069 KB (6% of page weight)

Unused JS 2069 KB

0.48g unnecessary CO2 per visit

Actual transfer 35180 KB
Theoretical minimum 33111 KB
Potential savings 2069 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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