https://bb.com.br
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
74
GRADE
C
FIX
2
REVIEW
2
PASS
3
INFO
1
Checks
83 PASS 2 REVIEW 2 FIX
DCO2 Per Page LoadAction1.44g CO2 per viewFIX
CO2 Per Page Load
Action1.44g CO2 per view
1.44g CO2 per view
Warning::
1.44g CO2 per page view
This page transfers 6.1 MB, producing an estimated 1.44g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.30g, end-user device 1.10g.
Got: 1.44g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 172.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 172.6 kg of CO2 annually — equivalent to charging 21572 smartphones.
Info::
Green hosting reduces data center emissions
1.44g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 27% of websites
Sustainable Web Design model v4 · Page size: 6.1 MB
Your site
1.44g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.04g
Network
0.30g
End-user device
1.10g
At 10,000 monthly views: Monthly: 14.4 kg · Annual: 172.6 kg · ≈ 21572 smartphone charges
FCarbon BudgetAction73th percentileFIX
Carbon Budget
Action73th percentile
73th percentile
Warning::
1.44g CO2 — above the median website (0.60g)
Heavier than an estimated 27% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 73th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.44g
73rd percentile
Cleaner than 27% of websites
✗ Above the median website
vs Median 140% more
vs Target 188% more
CTransfer EfficiencyAction74% efficientREVIEW
Transfer Efficiency
Action74% efficient
74% efficient
Warning::
Transfer efficiency: 74%
An estimated 1624 KB (26%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1624 KB of unused JavaScript. This wasted data produces 0.38g of unnecessary CO2 per page view.
Total waste: 1624 KB (26% of page weight)
Unused JS 1624 KB
0.38g unnecessary CO2 per visit
Actual transfer 6222 KB
Theoretical minimum 4598 KB
Potential savings 1624 KB (0.38g CO2)
See Deep Analysis sections above for specific optimizations.
BWeb Font Weight Variants5 font weights loaded across 2 famil(y/ies)REVIEW
Web Font Weight Variants
5 font weights loaded across 2 famil(y/ies)
5 font weights loaded across 2 famil(y/ies)
Info::
5 font weights loaded -- review whether all are used
5+ weights for a single page is often more than needed. Compare against the actual font-weight CSS rules in your stylesheets; trim weights that aren't applied to any element. Affected families: Roboto, Roboto%3A100%2C100italic%2C200%2C200italic%2C300%2C300italic%2C400%2C400italic%2C500%2C500italic%2C600%2C600italic%2C700%2C700italic%2C800%2C800italic%2C900%2C900italic%7CRoboto Slab%3A100%2C100italic%2C200%2C200italic%2C300%2C300italic%2C400%2C400italic%2C500%2C500italic%2C600%2C600italic%2C700%2C700italic%2C800%2C800italic%2C900%2C900italic.
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 43 KB (vs 6222 KB first visit). 244 of 250 resources are served from browser cache, saving 1.43g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.44g)
First visit
6222 KB
Repeat visit
43 KB
99% reduction on repeat visits
Saving 1.43g CO2 per returning visitor
244 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
Image Optimization60 images, 8 KB total, 6 KB wastedINFO
Image Optimization
60 images, 8 KB total, 6 KB wasted
Image Optimization Audit
Total Images
60
Total Size
8 KB
Oversized
8
Wasted
6 KB
4 missing alt text 56 missing dimensions 51 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.