Almost all cosmetic packaging is thrown away. But with a bit of forethought, it’s not hard to keep both your skin and your conscience squeaky clean Change by degrees offers life hacks and sustainable living tips each Saturday to help reduce your household’s carbon footprint Got a question or tip for reducing household emissions? Email us at changebydegrees@theguardian.com   Almost all cosmetic packaging is thrown away. But with a bit of forethought, it’s not hard to keep both your skin and your