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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
65
GRADE
D
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
D
CO2 Per Page Load
Action
1.31g CO2 per view
FIX
1.31g CO2 per view
Warning::
1.31g CO2 per page view
This page transfers 5.5 MB, producing an estimated 1.31g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.27g, end-user device 1.01g.
Got: 1.31g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 157.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 157.2 kg of CO2 annually — equivalent to charging 19655 smartphones.
Info::
Green hosting reduces data center emissions

1.31g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 30% of websites

Sustainable Web Design model v4 · Page size: 5.5 MB

Your site
1.31g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.27g
End-user device
1.01g
At 10,000 monthly views: Monthly: 13.1 kg · Annual: 157.2 kg · ≈ 19655 smartphone charges
D
Carbon Budget
Action
70th percentile
FIX
70th percentile
Warning::
1.31g CO2 — above the median website (0.60g)
Heavier than an estimated 30% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 70th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.31g

70th percentile

Cleaner than 30% of websites

✗ Above the median website

vs Median 118% more
vs Target 162% more
C
Transfer Efficiency
Action
68% efficient
REVIEW
68% efficient
Warning::
Transfer efficiency: 68%
An estimated 1807 KB (32%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1807 KB of unused JavaScript. This wasted data produces 0.42g of unnecessary CO2 per page view.
68% efficient

Total waste: 1807 KB (32% of page weight)

Unused JS 1807 KB

0.42g unnecessary CO2 per visit

Actual transfer 5669 KB
Theoretical minimum 3861 KB
Potential savings 1807 KB (0.42g CO2)

See Deep Analysis sections above for specific optimizations.

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 Next.js✗CDN Fastly✓

Fastly: 100% renewable energy for edge network

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 273 KB (vs 5669 KB first visit). 693 of 752 resources are served from browser cache, saving 1.25g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 1.31g)
First visit
5669 KB
Repeat visit
273 KB

95% reduction on repeat visits

Saving 1.25g CO2 per returning visitor

693 resources served from cache · 59 resources re-downloaded

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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