https://realsimple.com
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
2
REVIEW
1
PASS
3
INFO
0
Checks
63 PASS 1 REVIEW 2 FIX
FCO2 Per Page LoadAction1.58g CO2 per viewFIX
CO2 Per Page Load
Action1.58g CO2 per view
1.58g CO2 per view
Warning::
1.58g CO2 per page view
This page transfers 6.7 MB, producing an estimated 1.58g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.33g, end-user device 1.21g.
Got: 1.58g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 189.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 189.0 kg of CO2 annually — equivalent to charging 23630 smartphones.
Info::
Green hosting reduces data center emissions
1.58g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 23% of websites
Sustainable Web Design model v4 · Page size: 6.7 MB
Your site
1.58g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.04g
Network
0.33g
End-user device
1.21g
At 10,000 monthly views: Monthly: 15.8 kg · Annual: 189.0 kg · ≈ 23630 smartphone charges
FCarbon BudgetAction77th percentileFIX
Carbon Budget
Action77th percentile
77th percentile
Warning::
1.58g CO2 — above the median website (0.60g)
Heavier than an estimated 23% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 77th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.58g
77th percentile
Cleaner than 23% of websites
✗ Above the median website
vs Median 163% more
vs Target 215% more
BTransfer Efficiency87% efficientREVIEW
Transfer Efficiency
87% efficient
87% efficient
Info::
Transfer efficiency: 87%
An estimated 887 KB (13%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 887 KB of unused JavaScript. This wasted data produces 0.21g of unnecessary CO2 per page view.
Total waste: 887 KB (13% of page weight)
Unused JS 887 KB
0.21g unnecessary CO2 per visit
Actual transfer 6815 KB
Theoretical minimum 5927 KB
Potential savings 887 KB (0.21g 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: Google Cloud, CDN: Cloudflare
Info::
Google Cloud: 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 Google Cloud✓CDN Cloudflare✓
Google Cloud: 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 Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 141 KB (vs 6815 KB first visit). 487 of 510 resources are served from browser cache, saving 1.54g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.58g)
First visit
6815 KB
Repeat visit
141 KB
98% reduction on repeat visits
Saving 1.54g CO2 per returning visitor
487 resources served from cache · 23 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.