Between this and the recent story that global warming presents a threat to the survival of cocoa beans, you'd think people would be paying a lot more attention to the possibility of losing their favorite beverage:

Forget about super-sizing into the trenta a few years from now: Starbucks is warning of a threat to the world coffee supply because of climate change.

In a telephone interview with the Guardian, Jim Hanna, the company's sustainability director, said its farmers were already seeing the effects of a changing climate, with severe hurricanes and more resistant bugs reducing crop yields.

The company is now preparing for the possibility of a serious threat to global supplies. "What we are really seeing as a company as we look 10, 20, 30 years down the road – if conditions continue as they are – is a potentially significant risk to our supply chain, which is the Arabica coffee bean," Hanna said.

It was the second warning in less than a month of a threat to a food item many people can't live without.

New research from the International Centre for Tropical Agriculture warned it would be too hot to grow chocolate in much of the Ivory Coast and Ghana, the world's main producers, by 2050.

Hanna is to travel to Washington on Friday to brief members of Congress on climate change and coffee at an event sponsored by the Union of Concerned Scientists.

The coffee giant is part of a business coalition that has been trying to push Congress and the Obama administration to act on climate change – without success, as Hanna acknowledged.

The coalition, including companies like Gap, are next month launching a new campaign – showcasing their own action against climate change – ahead of the release of a landmark science report from the UN's IPCC.

Hanna told the Guardian the company's suppliers, who are mainly in Central America, were already experiencing changing rainfall patterns and more severe pest infestations.