Clean

https://en.wikipedia.org/wiki/Clean_technology

1. http://cleantechnica.com/
2. http://www.cleantech.org/
3. https://www.cleantech.com/
4. http://www.icleantech.com/
5. http://www.kankyocleantech.com/

Tube
https://www.youtube.com/results?q=cleantech

Slides
https://www.slideshare.net/search/slideshow?searchfrom=header&q=cleantech