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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
69
GRADE
D
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
1.32g CO2 per view
FIX
1.32g CO2 per view
Warning::
1.32g CO2 per page view
This page transfers 5.6 MB, producing an estimated 1.32g 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: 1.32g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 158.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 158.2 kg of CO2 annually — equivalent to charging 19773 smartphones.
Info::
Green hosting reduces data center emissions

1.32g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 30% of websites

Sustainable Web Design model v4 · Page size: 5.6 MB

Your site
1.32g
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: 13.2 kg · Annual: 158.2 kg · ≈ 19773 smartphone charges
D
Carbon Budget
Action
70th percentile
FIX
70th percentile
Warning::
1.32g 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

1.32g

70th percentile

Cleaner than 30% of websites

✗ Above the median website

vs Median 120% more
vs Target 164% 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 Pantheon✗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 43 KB (vs 5703 KB first visit). 156 of 157 resources are served from browser cache, saving 1.31g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.32g)
First visit
5703 KB
Repeat visit
43 KB

99% reduction on repeat visits

Saving 1.31g CO2 per returning visitor

156 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
93% efficient
PASS
93% efficient
Info::
Transfer efficiency: 93%
Only 374 KB of potential savings identified. Your page is well-optimized for size.
93% efficient

Total waste: 374 KB (7% of page weight)

Unused JS 374 KB

0.09g unnecessary CO2 per visit

Actual transfer 5703 KB
Theoretical minimum 5329 KB
Potential savings 374 KB (0.09g 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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