General Mills Faces Criticism Over Use of Plastic Packaging

General Mills Inc. is facing growing criticism from a shareholder after failing to respond to calls for the company to bolster its sustainable-packaging efforts.

Almost two years ago, Green Century Fundsreceived majority support from General Mills shareholders for a resolution requesting the company set goals to reduce its plastic waste and provide regular progress reports.

Green Century says little headway has been made. As a result, the investment firm, which oversees roughly $1 billion, has just filed another plastics-focused resolution for the company’s annual meeting scheduled for later this year.

“Investors want General Mills to take their concerns seriously,” ...