Skip to content
https://elpais.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
64
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
1.18g CO2 per view
FIX
1.18g CO2 per view
Warning::
1.18g CO2 per page view
This page transfers 4.2 MB, producing an estimated 1.18g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.22g, network 0.20g, end-user device 0.76g.
Got: 1.18g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 141.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 141.3 kg of CO2 annually — equivalent to charging 17661 smartphones.

1.18g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 34% of websites

Sustainable Web Design model v4 · Page size: 4.2 MB

Your site
1.18g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.22g
Network
0.20g
End-user device
0.76g
At 10,000 monthly views: Monthly: 11.8 kg · Annual: 141.3 kg · ≈ 17661 smartphone charges
D
Green Hosting
Action
Not green
FIX
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
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 HostingNot Green Hosted
Hosting Amazon Web Services✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
66th percentile
FIX
66th percentile
Warning::
1.18g CO2 — above the median website (0.60g)
Heavier than an estimated 34% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 66th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.18g

66th percentile

Cleaner than 34% of websites

✗ Above the median website

vs Median 96% more
vs Target 135% more
B
Transfer Efficiency
87% efficient
REVIEW
87% efficient
Info::
Transfer efficiency: 87%
An estimated 557 KB (13%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 557 KB of unused JavaScript. This wasted data produces 0.15g of unnecessary CO2 per page view.
87% efficient

Total waste: 557 KB (13% of page weight)

Unused JS 557 KB

0.15g unnecessary CO2 per visit

Actual transfer 4257 KB
Theoretical minimum 3700 KB
Potential savings 557 KB (0.15g 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
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 126 KB (vs 4257 KB first visit). 132 of 135 resources are served from browser cache, saving 1.14g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 1.18g)
First visit
4257 KB
Repeat visit
126 KB

97% reduction on repeat visits

Saving 1.14g CO2 per returning visitor

132 resources served from cache · 3 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