Skip to content
https://nick.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
58
GRADE
D
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.43g CO2 per view
FIX
1.43g CO2 per view
Warning::
1.43g CO2 per page view
This page transfers 5.1 MB, producing an estimated 1.43g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.27g, network 0.25g, end-user device 0.92g.
Got: 1.43g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 171.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 171.9 kg of CO2 annually — equivalent to charging 21490 smartphones.

1.43g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 27% of websites

Sustainable Web Design model v4 · Page size: 5.1 MB

Your site
1.43g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.27g
Network
0.25g
End-user device
0.92g
At 10,000 monthly views: Monthly: 14.3 kg · Annual: 171.9 kg · ≈ 21490 smartphone charges
D
Green Hosting
Action
Unknown
FIX
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
73th percentile
FIX
73th percentile
Warning::
1.43g CO2 — above the median website (0.60g)
Heavier than an estimated 27% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 73th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.43g

73rd percentile

Cleaner than 27% of websites

✗ Above the median website

vs Median 139% more
vs Target 187% more
C
Transfer Efficiency
Action
63% efficient
REVIEW
63% efficient
Warning::
Transfer efficiency: 63%
An estimated 1937 KB (37%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1937 KB of unused JavaScript. This wasted data produces 0.54g of unnecessary CO2 per page view.
63% efficient

Total waste: 1937 KB (37% of page weight)

Unused JS 1937 KB

0.54g unnecessary CO2 per visit

Actual transfer 5180 KB
Theoretical minimum 3243 KB
Potential savings 1937 KB (0.54g 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+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 95 KB (vs 5180 KB first visit). 125 of 130 resources are served from browser cache, saving 1.41g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.43g)
First visit
5180 KB
Repeat visit
95 KB

98% reduction on repeat visits

Saving 1.41g CO2 per returning visitor

125 resources served from cache · 5 resources re-downloaded

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback