H&M

H&M produces a staggering 3 billion garments each year, making it the largest offender by volume on this list despite its greenwashed 'Conscious' line. In 2010 one of its New York stores was caught cutting up unsold clothing before throwing it out, contradicting the brand's recycling message. Its garment-collection program recovers only a small fraction of what it sells, undercutting its sustainability claims.