Delta Air Lines shareholders voted Thursday in favor of a measure to require the company to report its climate lobbying activities, a move the company's board of directors opposed.
It's unusual for shareholders to vote against a board's wishes.
A similar proposal received a 46% vote by Delta shareholders last year. However, institutional investors have increasingly pushed companies on environmental issues, seeking to better understand climate risk.
The shareholder proposal that was approved will require the board to issue a report within the next year describing how Atlanta-based Delta's lobbying activities align with the Paris climate agreement's goal to limit average global warming to "well below 2 degrees Celsius," and how the company plans to mitigate associated risks.
The proposal was submitted by French banking giant BNP Paribas Asset Management.
Delta's board opposed the measure, saying the company has been transparent about its lobbying efforts and environmental policies that are "aligned with responsible climate action."
The airline announced last year a plan to invest $1 billion toward carbon neutrality over 10 years.
While Delta and other carriers are buying carbon offsets and testing and exploring the use of biofuels, there are yet to be any viable large-scale solutions such as electric commercial planes or a 100% sustainable aviation fuel system.