https://carbonbrief.org
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
76
GRADE
C
FIX
1
REVIEW
2
PASS
3
INFO
0
Checks
63 PASS 2 REVIEW 1 FIX
DCarbon BudgetAction55th percentileFIX
Carbon Budget
Action55th percentile
55th percentile
Warning::
0.79g CO2 — above the median website (0.60g)
Heavier than an estimated 45% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 55th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.79g
55th percentile
Cleaner than 45% of websites
✗ Above the median website
vs Median 31% more
vs Target 57% more
BCO2 Per Page Load0.79g CO2 per viewREVIEW
CO2 Per Page Load
0.79g CO2 per view
0.79g CO2 per view
Info::
0.79g CO2 per page view
This page transfers 3.3 MB, producing an estimated 0.79g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.16g, end-user device 0.60g.
Got: 0.79g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 94.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 94.5 kg of CO2 annually — equivalent to charging 11806 smartphones.
Info::
Green hosting reduces data center emissions
0.79g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 45% of websites
Sustainable Web Design model v4 · Page size: 3.3 MB
Your site
0.79g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.16g
End-user device
0.60g
At 10,000 monthly views: Monthly: 7.9 kg · Annual: 94.5 kg · ≈ 11806 smartphone charges
CTransfer EfficiencyAction67% efficientREVIEW
Transfer Efficiency
Action67% efficient
67% efficient
Warning::
Transfer efficiency: 67%
An estimated 1140 KB (33%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1140 KB of unused JavaScript. This wasted data produces 0.26g of unnecessary CO2 per page view.
Total waste: 1140 KB (33% of page weight)
Unused JS 1140 KB
0.26g unnecessary CO2 per visit
Actual transfer 3405 KB
Theoretical minimum 2265 KB
Potential savings 1140 KB (0.26g CO2)
See Deep Analysis sections above for specific optimizations.
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: WP Engine, CDN: Cloudflare
Info::
WP Engine: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 WP Engine✓CDN Cloudflare✓
WP Engine: Verified by the Green Web Foundation
Cloudflare: 100% renewable energy for global network since 2019
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight95% cachedPASS
Repeat Visit Weight
95% cached
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 185 KB (vs 3405 KB first visit). 161 of 167 resources are served from browser cache, saving 0.74g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 0.79g)
First visit
3405 KB
Repeat visit
185 KB
95% reduction on repeat visits
Saving 0.74g CO2 per returning visitor
161 resources served from cache · 6 resources re-downloaded
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.