Skip to content
https://metoffice.gov.uk

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
72
GRADE
C
FIX
1
REVIEW
4
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 4 REVIEW 1 FIX
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::
Akamai: Committed to 50% renewable by 2030
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 Not identified✗CDN Akamai✗

Akamai: Committed to 50% renewable by 2030

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
CO2 Per Page Load
0.55g CO2 per view
REVIEW
0.55g CO2 per view
Info::
0.55g CO2 per page view
This page transfers 1.9 MB, producing an estimated 0.55g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.10g, network 0.09g, end-user device 0.35g.
Got: 0.55g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 65.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 65.8 kg of CO2 annually — equivalent to charging 8228 smartphones.

0.55g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 56% of websites

Sustainable Web Design model v4 · Page size: 1.9 MB

Your site
0.55g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.10g
Network
0.09g
End-user device
0.35g
At 10,000 monthly views: Monthly: 5.5 kg · Annual: 65.8 kg · ≈ 8228 smartphone charges
B
Carbon Budget
44th percentile
REVIEW
44th percentile
Info::
0.55g CO2 — below the median website (0.60g)
Better than an estimated 56% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 44th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.55g

44th percentile

Cleaner than 56% of websites

✗ Above the median website

vs Median 9% cleaner ✓
vs Target 10% more
B
Transfer Efficiency
82% efficient
REVIEW
82% efficient
Info::
Transfer efficiency: 82%
An estimated 363 KB (18%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 363 KB of unused JavaScript. This wasted data produces 0.10g of unnecessary CO2 per page view.
82% efficient

Total waste: 363 KB (18% of page weight)

Unused JS 363 KB

0.10g unnecessary CO2 per visit

Actual transfer 1983 KB
Theoretical minimum 1620 KB
Potential savings 363 KB (0.10g 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
84% cached
PASS
84% cached
Info::
84% reduction on repeat visits
Returning visitors download only 315 KB (vs 1983 KB first visit). 109 of 111 resources are served from browser cache, saving 0.46g CO2 per repeat visit.
Info::
Repeat visit: 0.09g CO2 (first visit: 0.55g)
First visit
1983 KB
Repeat visit
315 KB

84% reduction on repeat visits

Saving 0.46g CO2 per returning visitor

109 resources served from cache · 2 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