Which kind of fabric is best for the planet? Unfortunately, trying to choose might leave you with decision paralysis. While it’s well-advised to avoid the petroleum-based synthetic fibers such as polyester (which can burn through millions of barrels of oil), knowing what kinds of fabric to buy instead is hardly clear. Are you better off with breathable but resource-hungry cotton, or is fast-growing but heavily processed bamboo a smarter choice for the environment? Let’s look closer at the growing and processing methods of six of today’s most popular natural fibers to find out.