Walmart's next steps on sustainability are reducing toxic chemicals in common household products and suppliers' fertilizer use.
Dow Jones Sustainability Index chooses Best-in-Class leaders - those that lead their respective industries.
Microsoft charges its divisions for the carbon they produce and invests in wind, sustainable agriculture and many other projects.
The first country to do so, it requires larger companies to invest in corporate responsibility.
The high-tech company has revived an ancient route across central Asia, saving time and reducing emissions.
When companies file as Benefit Corporations, the law requires they take the environment, community, employees and suppliers into account when making business decisions, as opposed to being solely focused on profit.
Staples' goal is to have 1000 buildings certified by the end of 2016.
The B Team hopes to transform business into a force for good, where companies are no longer only driven by profits.
Dell is half way there, using innovative materials like mushroom and bamboo packaging for the past few years.
Lisa Jackson, who just left her post as head of the EPA is taking over Apple's environmental initiatives.