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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
D
CO2 Per Page Load
Action
0.93g CO2 per view
FIX
0.93g CO2 per view
Info::
0.93g CO2 per page view
This page transfers 3.9 MB, producing an estimated 0.93g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.19g, end-user device 0.72g.
Got: 0.93g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 112.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 112.0 kg of CO2 annually — equivalent to charging 14006 smartphones.
Info::
Green hosting reduces data center emissions

0.93g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 41% of websites

Sustainable Web Design model v4 · Page size: 3.9 MB

Your site
0.93g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.19g
End-user device
0.72g
At 10,000 monthly views: Monthly: 9.3 kg · Annual: 112.0 kg · ≈ 14006 smartphone charges
D
Carbon Budget
Action
59th percentile
FIX
59th percentile
Warning::
0.93g CO2 — above the median website (0.60g)
Heavier than an estimated 41% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 59th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.93g

59th percentile

Cleaner than 41% of websites

✗ Above the median website

vs Median 56% more
vs Target 87% 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 11 KB (vs 4039 KB first visit). 181 of 183 resources are served from browser cache, saving 0.93g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.93g)
First visit
4039 KB
Repeat visit
11 KB

100% reduction on repeat visits

Saving 0.93g CO2 per returning visitor

181 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
97% efficient
PASS
97% efficient
Info::
Transfer efficiency: 97%
Only 136 KB of potential savings identified. Your page is well-optimized for size.
97% efficient

Total waste: 136 KB (3% of page weight)

Unused JS 136 KB

0.03g unnecessary CO2 per visit

Actual transfer 4039 KB
Theoretical minimum 3903 KB
Potential savings 136 KB (0.03g 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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