Ecosia.org is a search engine/browser that plants trees with their profits. On average, a tree is planted every 42 searches. They publish financial records every month & protect your privacy. They have now planted over 65 million trees. 
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How efficient is this browser? Small search engines usually are quite inaccurate in terms of what I am looking for in my experience.
Ecosia utilizes Bing. Less than 5% of the time I have to switch over to Google.
Here’s some more information about them: https://info.ecosia.org/what
Monthly financial reports: https://blog.ecosia.org/ecosia-financial-reports-tree-planting-receipts/