Update README.md

README.md

@@ -99,3 +99,14 @@ $result = $currencylayer
 API Documentation
 -----
 See: [currencylayer.com/documentation](https://currencylayer.com/documentation)
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+
+# TREEWARE
+-----
+You're free to use this package, but if it makes it to your production environment you are required to buy the world a tree.
+
+It’s now common knowledge that one of the best tools to tackle the climate crisis and keep our temperatures from rising above 1.5C is to <a href="https://www.bbc.co.uk/news/science-environment-48870920">plant trees</a>. If you support this package and contribute to the Treeware forest you’ll be creating employment for local families and restoring wildlife habitats.
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+You can buy trees here [offset.earth/treeware](https://plant.treeware.earth/oceanappications/currencylayer-php-client)
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+Read more about Treeware at [treeware.earth](http://treeware.earth)