Skip to content
https://www.forbes.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
57
GRADE
D
FIX
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.62g CO2 per view
FIX
1.62g CO2 per view
Warning::
1.62g CO2 per page view
This page transfers 6.9 MB, producing an estimated 1.62g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.34g, end-user device 1.25g.
Got: 1.62g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 194.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 194.9 kg of CO2 annually — equivalent to charging 24360 smartphones.
Info::
Green hosting reduces data center emissions

1.62g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 21% of websites

Sustainable Web Design model v4 · Page size: 6.9 MB

Your site
1.62g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.34g
End-user device
1.25g
At 10,000 monthly views: Monthly: 16.2 kg · Annual: 194.9 kg · ≈ 24360 smartphone charges
F
Carbon Budget
Action
79th percentile
FIX
79th percentile
Warning::
1.62g CO2 — above the median website (0.60g)
Heavier than an estimated 21% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 79th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.62g

79th percentile

Cleaner than 21% of websites

✗ Above the median website

vs Median 171% more
vs Target 225% more
D
Transfer Efficiency
Action
57% efficient
FIX
57% efficient
Warning::
Transfer efficiency: 57%
An estimated 3029 KB (43%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 3029 KB of unused JavaScript. This wasted data produces 0.70g of unnecessary CO2 per page view.
57% efficient

Total waste: 3029 KB (43% of page weight)

Unused JS 3029 KB

0.70g unnecessary CO2 per visit

Actual transfer 7026 KB
Theoretical minimum 3996 KB
Potential savings 3029 KB (0.70g 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
94% cached
PASS
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 436 KB (vs 7026 KB first visit). 369 of 392 resources are served from browser cache, saving 1.52g CO2 per repeat visit.
Info::
Repeat visit: 0.10g CO2 (first visit: 1.62g)
First visit
7026 KB
Repeat visit
436 KB

94% reduction on repeat visits

Saving 1.52g CO2 per returning visitor

369 resources served from cache · 23 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