https://tutsplus.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
80
GRADE
B
FIX
2
REVIEW
0
PASS
4
INFO
0
Checks
64 PASS 2 FIX
DCO2 Per Page LoadAction0.86g CO2 per viewFIX
CO2 Per Page Load
Action0.86g CO2 per view
0.86g CO2 per view
Info::
0.86g CO2 per page view
This page transfers 3.6 MB, producing an estimated 0.86g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.18g, end-user device 0.66g.
Got: 0.86g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 103.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 103.5 kg of CO2 annually — equivalent to charging 12937 smartphones.
Info::
Green hosting reduces data center emissions
0.86g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 43% of websites
Sustainable Web Design model v4 · Page size: 3.6 MB
Your site
0.86g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.18g
End-user device
0.66g
At 10,000 monthly views: Monthly: 8.6 kg · Annual: 103.5 kg · ≈ 12937 smartphone charges
DCarbon BudgetAction57th percentileFIX
Carbon Budget
Action57th percentile
57th percentile
Warning::
0.86g CO2 — above the median website (0.60g)
Heavier than an estimated 43% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 57th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.86g
57th percentile
Cleaner than 43% of websites
✗ Above the median website
vs Median 44% more
vs Target 72% more
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: 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 Cloudflare✓CDN Cloudflare✓
Cloudflare: 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 Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 23 KB (vs 3731 KB first visit). 55 of 57 resources are served from browser cache, saving 0.86g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.86g)
First visit
3731 KB
Repeat visit
23 KB
99% reduction on repeat visits
Saving 0.86g CO2 per returning visitor
55 resources served from cache · 2 resources re-downloaded
A+Transfer Efficiency97% efficientPASS
Transfer Efficiency
97% efficient
97% efficient
Info::
Transfer efficiency: 97%
Only 107 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 107 KB (3% of page weight)
Unused JS 107 KB
0.02g unnecessary CO2 per visit
Actual transfer 3731 KB
Theoretical minimum 3623 KB
Potential savings 107 KB (0.02g CO2)
See Deep Analysis sections above for specific optimizations.
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.