Siemens, the German industrial group which makes everything from power plants to medical imaging machines, is the most sustainable company in the world.
That's according to Corporate Knights, a media and investment company that lists the world’s greenest businesses every year.
Companies have to be among the top sustainability performers in their industries in order to be counted. The selection starts with a pool of 4,973 listed companies whose market capitalization is greater than $2 billion (€1.9 billion). They are then rated on 14 metrics using data that's publicly available about how the