Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Device:

Mobile Desktop

Checks

2 PASS 2 REVIEW 3 FIX

CO2 Per Page Load

Action

3.97g CO2 per view

FIX

3.97g CO2 per view

3.97g CO2 per page view

This page transfers 14.0 MB, producing an estimated 3.97g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.73g, network 0.69g, end-user device 2.55g.

Got: 3.97g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 476.0 kg CO2/year

With 10,000 page views per month, this page would generate approximately 476.0 kg of CO2 annually — equivalent to charging 59499 smartphones.

3.97g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 14.0 MB

Your site

3.97g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.73g

Network

0.69g

End-user device

2.55g

At 10,000 monthly views: Monthly: 39.7 kg · Annual: 476.0 kg · ≈ 59499 smartphone charges

Green Hosting

Action

Unknown

FIX

Unknown

Hosting provider could not be identified

Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.

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 HostingUnable to Determine

Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

Action

95th percentile

FIX

95th percentile

3.97g CO2 — above the median website (0.60g)

Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 95th percentile

Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.

Top 10%

Target

Median website

3.97g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 561% more

vs Target 693% more

Web Font Weight Variants

5 font weights loaded across 1 famil(y/ies)

REVIEW

5 font weights loaded across 1 famil(y/ies)

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: Lato.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Repeat Visit Weight

92% cached

PASS

92% cached

92% reduction on repeat visits

Returning visitors download only 1160 KB (vs 14342 KB first visit). 92 of 93 resources are served from browser cache, saving 3.65g CO2 per repeat visit.

Repeat visit: 0.32g CO2 (first visit: 3.97g)

First visit

14342 KB

Repeat visit

1160 KB

92% reduction on repeat visits

Saving 3.65g CO2 per returning visitor

92 resources served from cache · 1 resources re-downloaded

A+

Transfer Efficiency

94% efficient

PASS

94% efficient

Transfer efficiency: 94%

Only 820 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 820 KB (6% of page weight)

Unused JS 820 KB

0.23g unnecessary CO2 per visit

Actual transfer 14342 KB

Theoretical minimum 13521 KB

Potential savings 820 KB (0.23g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

23 images, 7940 KB total, 4896 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

7940 KB

Oversized

Wasted

4896 KB

21 missing dimensions 13 missing lazy loading

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.