Cleanet.org - SEO Checker

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Overview of the SEO Check
Meta information
74% 
Page quality
88% 
Page structure
62% 
Link structure
51% 
Server
78% 
External factors
100% 
SEO Score
Response time
1.20 s
File size
71.60 kB
Words
1378
Media files
23
Number of links
62 internal / 34 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
CLEAN - a Collection of Climate and Energy Education Resources
The page title should be shorter than 580 pixels. It is 594 pixels long. Optimize title
There are no duplicate words in the title
Meta description
(Critically important)
Our team of educators and scientists has reviewed and organized the best free teaching resources for K-12 through college. Go Entire Collection Activities Videos Visualizations Entire Site Featured Resource ...
The meta description is too long: 1289 pixels from max. 1000 pixels. Optimize description
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
No canonical link is specified.
Language
(Somewhat important)
Language detected in text: en
Language defined in HTML: en
Server location: Germany
The following language is defined by HTML: en
Alternate/Hreflang Links
(Somewhat important)
There are no alternate links specified on this page.
Other meta tags
(Somewhat important)
There is no rel next meta tag on this page.
There is no rel prev meta tag on this page.
Domain
(Somewhat important)
The domain is no subdomain.
The domain length is good.
The domain does not contain non-latin characters.
Page URL
(Somewhat important)
No parameters were found in the URL.
No session ID was found in the URL.
The URL does not have too many subdirectories.
Charset encoding
(Somewhat important)
The charset encoding (UTF-8) is set correctly.
Doctype
(Nice to have)
The Doctype markup is not in the first line of your HTML document. There must be no white spaces before the doctype markup.
The doctype HTML 5 is set correctly.
Favicon
(Nice to have)
The favicon is linked correctly.

Meta tags

NameValue
sercmodulelist1708 end
sercmodulenameCLEAN
sercmodulepeersEmpty
longtitleCLEAN - a Collection of Climate and Energy Education Resources
shorttitleCLEAN: Committed to Climate and Energy Education
sercvocabs455:1 455:19 455:21 end 455:1 455:19 455:23 end 61:1 61:3 end 674:2 end 74:1 end
vocab_page_forEmpty
serckeywordsEmpty
sercvocabkeywordsTeach the Earth Incorporating Societal Issues Climate Change, Energy, Page Index Page, Transactional Page, Project Site,
keywordsTeach the Earth Incorporating Societal Issues Climate Change, Energy, Page Index Page, Transactional Page, Project Site,
best_betsclimate lesson plan, climate change teacher resources, clean, hands on stem activities
page_id244318
descriptionOur team of educators and scientists has reviewed and organized the best free teaching resources for K-12 through college. Go Entire Collection Activities Videos Visualizations Entire Site Featured Resource ...
long_descriptionOur team of educators and scientists has reviewed and organized the best free teaching resources for K-12 through college. Go Entire Collection Activities Videos Visualizations Entire Site Featured Resource ...
datemodified20250423
datemodifiedminutes1255
datecreated20210701
datecreatedminutes1335
datecreated_solr_dt2021-07-01T18:35:41Z
news_date_expires2030121
news_date_stale2030121
datepublished20210701
datepublishedminutes1335
serctypepage live natural_home index
boost1
page_type_boost1
quality_boostEmpty
popularity_boost4
thumburlhttps://cdn.serc.carleton.edu/images/clean/clean_2021_logo.webp_crops/1eb0cba39d633fd50ce18196fd7611c1_80.webp
thumbwidth80
thumbheight60
thumbid252133
sercviewprivspublic
sercsearchablefilesEmpty
sort_stringEmpty
viewportwidth=device-width, initial-scale=1
langen
fb:app_id357747647995292
og:titleCLEAN: Committed to Climate and Energy Education
og:site_nameCLEAN
og:descriptionOur team of educators and scientists has reviewed and organized the best free teaching resources for K-12 through college. Go Entire Collection Activities Videos Visualizations Entire Site Featured Resource ...
og:localeen_US
og:typewebsite
og:urlhttps://cleanet.org/index.html
og:updated_time2025-04-23T12:55:33-0500
og:imagehttps://cdn.serc.carleton.edu/images/clean/clean_2021_logo.webp_crops/654f30e47abe3db19a30669fa422f31f.webp
x-ua-compatibleIE=Edge
Content-Typetext/html; charset=UTF-8

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Page quality

Content
(Critically important)
There are 4 text duplicates on this page:
  • Duplicate 1: If you wish to use this item outside this site in ways that exceed fai...
  • Duplicate 2: This item is offered under a Creative Commons Attribution-NonCommercia...
This page contains 1378 words. That's ok.
32.1% of the text are stop words.
Keywords used in the page title are also used in the page content. That's good!
Words from the H1 heading are used in the page content.
The page contains a listing, which indicates a good text layout.
37 paragraphs were found on this page.
The text content is perfect.
No placeholders texts or images were found.
The average number of words per sentence of 15.56 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No Apple touch icon is specified.
A viewport "width=device-width, initial-scale=1" is provided.
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 28 tags for this page.
Image SEO
(Somewhat important)
1 images have no alt attribute. The content of alt attributes is used by search engines.
Social Networks
(Nice to have)
This page is optimized perfectly for social networks.
Additional markup
(Nice to have)
No additional page markup was found.
HTTPS
(Somewhat important)
This website uses HTTPS to protect privacy and integrity of the exchanged data.
All included files are also transferred via HTTPS.

Media list

URLAlt attributeTitle
...an/clean_2021_logo_horizontal_small.webpCLEAN 2021 Logo, Blue Globe with colored lines coming out of the left and the words CLEAN, committed to climate and energy education written on the right.
...cy/climate/clean_logo_white_blue.v2.webpCLEAN Logo white on blue
...on.edu/images/clean/clean_2021_logo.webpCLEAN 2021 Logo, Blue Globe with colored lines coming out of the left and the words CLEAN, committed to climate and energy education written on the right.
...du/images/clean/educator_support.v5.webpEducator Support
...leton.edu/images/clean/ngss_logo.v2.webpNext Generation Science Standards Logo. A purple, orange, and green triangle to the left of the words, Next Generation Science Standards for states, by states.
serc.carleton.edu/images/feed-icon.pngNo alt attribute provided
....carleton.edu/images/clean/facebook.webpFacebook
...leton.edu/images/clean/bluesky_icon.webpBlueSky Icon
...eton.edu/images/clean/linkedin_icon.webpLinkedIn Icon
...carleton.edu/images/clean/instagram.webpInstagram
...arleton.edu/images/clean/youtube.v2.webpYoutube
...c/serc_standard_footer_logo_2020.v3.webpSERC
....edu/images/climatechange/cires_logo.gifCIRES logo
...rleton.edu/images/serc/nagt_tall.v2.webpNAGT
...du/images/serc/nsf_logo_transparent.webpNSF
...u/images/clean/noaa_logo_long_small.webpNOAA logo long small
...ean/doe_logo_1616184002668262572.v3.webpDepartment of Energy Logo. A green and yellow shield with an eagle head poking out of the top surrounded by the words, United States of America Department of Energy.
...du/images/clean/clean_2021_logo_100.webpCLEAN 2021 Logo, Blue Globe with colored lines coming out of the left and the words CLEAN, committed to climate and energy education written on the right.
...mages/clean/educator_support.v5_100.webpEducator Support
...n.edu/images/clean/ngss_logo.v2_100.webpNext Generation Science Standards Logo. A purple, orange, and green triangle to the left of the words, Next Generation Science Standards for states, by states.
...n.edu/images/clean/earth_day.v6_100.webpTwo students drawing a chalk picture of Earth on the pavement.
...iscussion_climate_conference.v7_100.webpGroup Discussion at Climate Conference, writing down and sharing thoughts on a poster.

Page structure

H1 heading
(Critically important)
Teaching about Climate and Energy?
The H1 heading is perfect.
Headings
(Important)
Some headings occur twice on the page.

Heading structure

Heading levelContent
H1 Teaching about Climate and Energy?
H2 Get Started Teaching Climate and Energy
H2 News from CLEAN
H2 Get Involved with CLEAN
H2 About CLEAN
H3 Renewable Energy: Solar
H3 Teach NGSS through CLEAN × Next Generation Science Standards Logo. A purple, orange, and green triangle to the left of the words, Next Generation Science Standards for states, by states.
H3 About
H3 Reuse
H4 Page Text
H4 Images
H4 Files
H5 Provenance
H5 Reuse Duplicate text
H5 Provenance Duplicate text
H5 Reuse Duplicate text
H5 Provenance Duplicate text
H5 Reuse Duplicate text
H5 Provenance Duplicate text
H5 Reuse Duplicate text
H5 Provenance Duplicate text
H5 Reuse Duplicate text
Some internal link anchor texts are too long.
Some internal links have dynamic parameters. All internal URLs, which are not marked as nofollow, should not contain dynamic parameters.
Some anchor texts are used more than once.
2 links don't have an anchor text.
The number of internal links is ok.
There are too many external links (34) on this page.

Found links on this page

LinkAttributesAnchor text
https://cleanet.org/index.htmlAnchor Skip to Main Content
https://cleanet.org/index.htmlAnchor Skip to Navigation
https://serc.carleton.edu/acco...External Subdomain Login
/admin/ajax/ajax_handler.php?a...No Text
https://cleanet.org/IMG-ALT CLEAN 2021 Logo, Blue Globe with colored lines coming out of the left and the words CLEAN, committed to climate and energy education written on the right.
/clean/educational_resources/c...Explore the Collection Activities, videos, and ideas for learning
/clean/literacy/index.htmlTeaching Climate and Energy Guidance for teachers
/clean/participate/index.htmlGet Involved CLEAN Network and more
https://cleanet.org/IMG-ALT CLEAN Logo white on blue
/clean/educational_resources/c...Explore the Collection
/clean/literacy/index.htmlTeaching Climate and Energy
/clean/participate/index.htmlGet Involved
/resources/58941.htmlRenewable Energy: Solar In this eight-lesson unit, students explore cultural connections with the sun, learn about light ... Activity
/clean/literacy/index.htmlIMG-ALT Educator Support
/clean/literacy/index.htmlExplore CLEAN Educator Support
/clean/educational_resources/c...Teach NGSS through CLEAN
/clean/educational_resources/c...IMG-ALT Next Generation Science Standards Logo. A purple, orange, and green triangle to the left of the words, Next Generation Science Standards for states, by states.
/clean/news.htmlAll the News from CLEAN
/clean/literacy/tools/enewslet...Get the CLEAN Educator Newsflash
https://cleanet.org/index.htmlAnchor Skip to search results
https://cleanet.org/index.htmlAnchor Skip to pagination
https://stemforall2022.videoha...External Subdomain STEM For All Video Showcase
http://climatechangeeducation....External Mobile Climate Science Labs
https://stemforall2022.videoha...External Subdomain Text duplicate STEM For All Video Showcase
/resources/58814.htmlThis site may be offline.
/clean/educational_resources/c...New Resources in CLEAN
/clean/community/webinars/inde...Upcoming Webinars
https://www.youtube.com/watch?...External Subdomain ACCELS Recording 2025
/clean/educational_resources/c...Updated CLEAN Collection Tags
/clean/community/cln/telecon_s...New CLEAN Call Structure
/clean/community/accelsummitACCEL Summit 2025
https://cires.colorado.edu/new...External Subdomain Newly Released: Climate Literacy Principles
/clean/literacy/climate/index....Climate Literacy Guide
https://cires.colorado.edu/new...External Subdomain URL anchor text
https://cires.colorado.edu/news/clean-revitalizes-climate-education-new-climate-literacy-principles
/clean/literacy/tools/nca.htmlNational Climate Assessment
https://cleanet.org/index.htmlAnchor CLEAN Calendar
/index.html?results_start=112
/index.html?results_start=213
/index.html?results_start=11Older »
https://serc.carleton.edu/rss/...External Subdomain RSS
/clean/community/index.htmlthe CLEAN Network
/clean/participate/suggest_res...Suggest a Resource
/clean/community/webinars/webi...CLEAN webinar series
/clean/literacy/tools/enewslet...Educator NewsFlash and Network NewsFlash newsletters
/clean/participate/index.htmlText duplicate Get Involved
/clean/community/index.htmlText duplicate the CLEAN Network
/clean/about_project/index.htmlLearn more about CLEAN
/clean/participate/suggest_eve...Suggest an event
/clean/participate/ongoing_opp...See Ongoing Events and Opportunities
/clean/about_project/cleandonateDonate to CLEAN
https://cleanet.org/index.htmlCLEAN
/clean/educational_resources/i...Collection of Educational Resources
/clean/literacy/index.htmlGuidance in Teaching Climate and Energy
/clean/community/index.htmlCLEAN Network
/clean/participate/index.htmlText duplicate Get Involved
/clean/about_project/index.htmlAbout the Project
/clean/news.htmlNews
/admin/ajax/ajax_handler.php?a...No Text
http://facebook.com/cleanet/External IMG-ALT Facebook
https://cleanetwork.bsky.social/External Subdomain IMG-ALT BlueSky Icon
https://www.linkedin.com/compa...External Subdomain IMG-ALT LinkedIn Icon
https://www.instagram.com/clea...External Subdomain IMG-ALT Instagram
https://www.youtube.com/channe...External Subdomain IMG-ALT Youtube
https://serc.carleton.edu/serc...External Subdomain IMG-ALT SERC
https://cires.colorado.edu/External Subdomain IMG-ALT CIRES logo
https://www.nagt.org/External Subdomain IMG-ALT NAGT
https://nsf.gov/External IMG-ALT NSF
https://www.noaa.gov/External Subdomain IMG-ALT NOAA logo long small
https://www.energy.gov/External Subdomain IMG-ALT Department of Energy Logo. A green and yellow shield with an eagle head poking out of the top surrounded by the words, United States of America Department of...
/clean/about_project/index.htmlAbout this Site
/serc/accessibility.htmlAccessibility
/serc/printer_friendly.htmlPrinting
/serc/privacy.htmlPrivacy
/clean/about/feedback.htmlFeedback
https://serc.carleton.edu/serc...External Subdomain Citing and Terms of Use
https://creativecommons.org/li...External Creative Commons license
https://cdn.serc.carleton.edu/...External Subdomain Text duplicate IMG-ALT CLEAN 2021 Logo, Blue Globe with colored lines coming out of the left and the words CLEAN, committed to climate and energy education written on the right.
/details/images/252133.htmlimage details
http://fairuse.stanford.edu/External Subdomain URL anchor text
http://fairuse.stanford.edu/
https://cdn.serc.carleton.edu/...External Subdomain Text duplicate IMG-ALT Educator Support
/details/images/352125.htmlText duplicate image details
http://creativecommons.org/lic...External URL anchor text
http://creativecommons.org/licenses/by-nc-sa/3.0/
https://cdn.serc.carleton.edu/...External Subdomain Text duplicate IMG-ALT Next Generation Science Standards Logo. A purple, orange, and green triangle to the left of the words, Next Generation Science Standards for states, by states.
/details/images/252245.htmlText duplicate image details
https://www.nextgenscience.org/External Subdomain URL anchor text
https://www.nextgenscience.org/
https://www.nextgenscience.org...External Subdomain URL anchor text
https://www.nextgenscience.org/trademark-and-copyright
https://cdn.serc.carleton.edu/...External Subdomain IMG-ALT Two students drawing a chalk picture of Earth on the pavement.
/details/images/254838.htmlText duplicate image details
https://www.flickr.com/photos/...External Subdomain URL anchor text
https://www.flickr.com/photos/44551921@N04/4534789566/in/faves-193262464@N06/
http://creativecommons.org/lic...External Text duplicate URL anchor text
http://creativecommons.org/licenses/by-nc-sa/3.0/
https://cdn.serc.carleton.edu/...External Subdomain IMG-ALT Group Discussion at Climate Conference, writing down and sharing thoughts on a poster.
/details/images/254485.htmlText duplicate image details
http://fairuse.stanford.edu/External Subdomain Text duplicate URL anchor text
http://fairuse.stanford.edu/
https://serc.carleton.edu/serc...External Subdomain More information on terms of use
/serc/quick_url.htmlWhat's This?
/clean/about_project/index.htmlfunded by grants

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://cleanet.org/index.html"
HTTP header
(Important)
The web server version is sent within the HTTP header.
No X-Powered HTTP header is sent.
The web server transmits the web page (HTML) in compressed form.
Performance
(Somewhat important)
The page response time is slow (1.20 seconds). The response time should be less than 0.4 seconds. Slow websites are bad for search engine bots and also result in bad user experience.
The file size of the HTML document is fine (72 kB).

HTTP Response Header

NameValue
content-typetext/html; charset=UTF-8
content-length21964
dateTue, 20 May 2025 04:46:59 GMT
x-configDEFAULT
servernginx/1.18.0 (Ubuntu)
set-cookie76 Characters
expiresThu, 19 Nov 1981 08:52:00 GMT
cache-controlno-store, no-cache, must-revalidate
pragmano-cache
varyAccept-Encoding
content-encodinggzip
x-cacheMiss from cloudfront
via1.1 f741e5a55bc5bd136ac1f5406bb11d88.cloudfront.net (CloudFront)
x-amz-cf-popFRA60-P10
x-amz-cf-idaLb7I5W4vCwK2JzOyLFgBlL67ZEOvB1Df3x_w7p7o16RegZw-uzzlg==
statuscode200
http_versionHTTP/2

External factors

This website has excellent links from other websites.
This page has backlinks from 170 referring domains.
This page has 527 backlinks.
This page has backlinks from 151 different ip addresses.

Links from Wikipedia

No links from Wikipedia were found.

Robots.txt

User-agent: * 
Disallow: /dev/ 
Disallow: /pipermail/ 
Disallow: /admin/ 
Disallow: /*?* 
Disallow: /remind.php 
Disallow: /redirect.php 
Disallow: /s/ 
Sitemap: https://serc.carleton.edu/sitemap.xml

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cleanet.org › index.html
CLEAN - a Collection of Climate and Energy Education Resources
Our team of educators and scientists has reviewed and organized the best free teaching resources for K-12 through college. Go Entire Collection Activities Videos Visualizations Entire Site Featured Resource ...

Most important keywords

Following keywords were found. You can check the keyword optimization of this page for each keyword.

KeywordResultRecheck
Climate74%Check
Teaching Climate70%Check
CLEAN68%Check
CLEAN collection67%Check
Energy66%Check
Teaching66%Check
Resources CLEAN66%Check
teaching resources65%Check
Collection62%Check
resources61%Check
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