The main purpose of the article is to...

A

criticize private companies that still do not calculate their own carbon footprints.

B

report on some recent and future tendencies of environmentally correct businesses.

C

justify why only large companies like Walmart and Apple can be considered truly green businesses.

D

encourage new companies to reduce their environmental impact only by limiting their energy consumption.

E

convince consumers to buy food products exclusively from green grocery stores, markets and restaurants.