Maple syrup producers face challenges in warming world

New Hampshire's maple syrup producers say they are feeling the impact of climate change, as winters become warmer and frigid nights so critical to their business become fewer.

Producers joined climate experts and Democratic U.S. Sen. Maggie Hassan of New Hampshire on Tuesday to talk about the state's changing climate and how it is affecting one of the state's most important industries.

Some producers talked of seeing a steep drop in the amounts of sap they are getting, while others are dealing with another trend attributed to warmer temperatures in which the sap goes up to the top of the trees rather than down to taps. Others complained about a drop in the sugar content of their sap.

Connecticut, Maine, Massachusetts, New Hampshire, New York, Pennsylvania and Vermont produced 3.78 million gallons of syrup in 2016, according to a Northeast maple syrup production statistics service run by the U.S. Department of Agriculture. Vermont is the clear leader, alone producing more than 47 per cent of the country's maple syrup.

Hassan said the state's changing climate could have dramatic effects on the natural resources that "define us as a state and are critical to our economy, our environment, and our way of life in New Hampshire."

"Unfortunately, we are already seeing the real impacts of climate change on our economy -- including on our maple syrup and ski industries," she said, referring to warmer winters and a decline in snow cover.

The ideal temperatures for sap production are in the 20s at night and 30s and 40s during the day. When the climate is in the 50s and 60s during the day and the nights stay warm, sap runs not to the taps, but to the tops of the trees, causing the tree to bloom. That can lead to a cloudy and off-tasting product.

But, despite the challenges, some producers and experts at the University of New Hampshire said technological fixes were helping the industry adapt -- and even extend the season.

"Climate change is man-made, and that's the good news," said Cameron Wake, who leads a research program at the University of New Hampshire that's investigating regional climate change. "Because if we caused the problem, we can fix the problem."