While organic does not necessarily mean 100% environment-friendly - growing cotton uses a lot of water, be it organic or not, although organic farms strive to make the most of rain water and use less irrigation - it does entail that no pesticides were used, which is particularly significant for cotton, as 25% of the world use of pesticide is solely devoted to cotton!
A major brand that makes organic cotton yarn in France in Plassard. It offers organic cotton in sports weight, as well as recycled cotton.
(I doubt their recycled cotton is suitable for crochet though, as it is more loosely spun; you need an extra firm ply in crochet, as you handle the yarn in the opposite direction from knitters and therefore unwind it at every turn of the hook. This article explains it quite well. Plassard's "coton bio", OTOH, is quite crochet friendly.)
You may recall I was crocheting this shawl in the spring - I also gave you a sneak view before I left on holidays. I was simply waiting for the opportunity of a photo shoot in natural outdoors to share pictures with you. The shade is a pale tea green, though it may appear washed out by the sunlight there was that day. (The pictures were taken in Northern France).
The pattern for this is "Eva's Shawl", one of the most popular crochet shawl patterns on Ravelry. It's free - here's the direct link to the PDF.
Final row of shawl has to be row 3.
Row 1: ch 1, sc in beginning chain, sc in each DC, 2 sc in top of beginning chain
Row 2: ch 3, DC in first sc, ch1, skip next sc, ch1, DC in next sc across, except in the 3 ch-1 sp increases: DC, ch1, DC ch-sp. Put final DC in top of beginning chain.
Row 3: ch3 (count as 1 DC), 2 DC in first DC, sc in next DC, 5 DC in next DC across.
This shawl is very lightweight, and perfect for those slightly chilly moments that may (or may not!) occur in early morning here in mid-season, just as this morning.