Here’s something I just found out about today..

Blackle..

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

Blackle is a website powered by Google Custom Search and created by Heap Media, which aims to save energy by displaying a black background and using grayish-white font color for search results. Blackle claims having saved nearly 6 MWh of electrical energy up to December 2016, a claim currently under dispute. For comparison, the average American household consumes 11 MWh of electrical energy per year.

A google search of similar engines comes up with Ecosia

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

“Ecosia is a web search engine based in Berlin, Germany, which donates 80% of its surplus income to non-profit conservationist organizations, with a focus on tree planting. Ecosia considers itself a “social business”, is CO2-neutral and claims to support full financial transparency, and is certified by B-Lab as a benefit corporation. According to Ecosia, over 39 million trees have been planted with its support as of 5 October 2018. “

and a whole bunch more…
https://www.treehugger.com/culture/the-best-green-search-engines.html

Blaxel
Earthle
Google-black blogspot
GreenerGle
iBlackle
Jabago
Ninja
Power-google blogspot
Search Greener
Search-in-color
Trek
Greygle: In easier-to-read grey