When choosing an eco-friendly sunblock, there are a few things to consider. Firstly, look for natural ingredients such as zinc oxide or titanium dioxide, which are known to be non-toxic and safe for the environment. Secondly, check the label to see if the product is certified organic, vegan and cruelty-free, to ensure that it is truly eco-friendly. Thirdly, look for sunblocks with a minimal amount of packaging, such as recyclable containers or biodegradable paper. Finally, avoid sunblocks with synthetic fragrances, as these can be damaging to the environment. Ultimately, choosing an eco-friendly sunblock is an important step in protecting yourself and the planet.