You might wonder what could put a sad face on the opening of a Krispy Kreme doughnut shop.

Meet the Forest Heroes Campaign - the joyful folks who have made a mission out of getting Krispy Kreme to stop frying doughnuts in palm oil that is produced by cutting down rainforests.

The campaign already has gone after Nestlé, Kellogg's, Mars, and General Mills, which have signed agreements to stop sourcing palm oil from deforestation.

But not Krispy Kreme, says the campaign's Joel Finkelstein. Its "corporate decision makers continue to buy 'no-questions-asked' palm oil from suppliers linked to deforestation like IOI Loders Croklaan, Cargill and Bunge."

The campaign intends to picket Tuesday's opening of the Krispy Kreme shop in New Castle, Del., with a banner, signs, and information about what it calls "the serious problem caused by the way Krispy Kreme makes their delicious treats." The campaign contends that the palm oil plantations are created by "cutting down tropical rainforests and destroying carbon-rich peatlands, sometimes using slave or child labor. It's destroying orangutan habitat and pushing Sumatran tigers to the edge of extinction – there are fewer than 400 Sumatran tigers left."

Krispy Kreme, asked about this campaign, replied:

"Our efforts to [buy sustainable palm oil] began in January 2014 with a commitment to only source products for our U.S. locations from suppliers who are certified members of the Roundtable of Sustainable Palm Oil (RSPO), and those who can guarantee compliance with all sustainable palm oil production methods as defined in the RSPO guidelines.

"Additionally, Krispy Kreme has committed to purchase enough GreenPalm certificates to cover 100% of its estimated usage of palm oil in the United States by the end of 2015, and we are working with GreenPalm and our international partners on similar initiatives. You may reference for further information on GreenPalm and how it supports sustainability palm production."