global warming not in weathermen's forecast

The debate over global warming has created predictable adversaries, pitting environmentalists against industry and coal-state Democrats against coastal liberals.

But it has also created tensions between two groups that might be expected to agree on the issue: climate scientists and meteorologists, especially those who serve as television weather forecasters.

Climatologists, who study weather patterns over time, almost universally endorse the view that the earth is warming and that humans have contributed to climate change. There is less of a consensus among meteorologists, who predict short-term weather patterns.

A study released on Monday by researchers at George Mason University and the University of Texas at Austin found that only about half of the 571 television weathercasters surveyed believed that global warming was occurring and fewer than a third believed that climate change was “caused mostly by human activities.”

More than a quarter of the weathercasters in the survey agreed with the statement “Global warming is a scam,” the researchers found.

The split between climate scientists and meteorologists is gaining attention in political and academic circles because polls show that public skepticism about global warming is increasing, and weather forecasters — especially those on television — dominate communications channels to the public. A study released this year by researchers at Yale and George Mason found that 56 percent of Americans trusted weathercasters to tell them about global warming far more than they trusted other news media or public figures like former Vice President Al Gore or Sarah Palin, the former vice-presidential candidate.

The American Meteorological Society, which confers its coveted seal of approval on qualified weather forecasters, has affirmed the conclusion of the United Nations’ climate panel that warming is occurring and that human activities are very likely the cause. In a statement sent to Congress in 2009, the meteorological society warned that the buildup of heat-trapping gases like carbon dioxide in the atmosphere would lead to “major negative consequences.”

Yet, climate scientists use very different scientific methods from the meteorologists. Heidi Cullen, a climatologist who straddled the two worlds when she worked at the Weather Channel, noted that meteorologists used models that were intensely sensitive to small changes in the atmosphere but had little accuracy more than seven days out. Dr. Cullen said meteorologists are often dubious about the work of climate scientists, who use complex models to estimate the effects of climate trends decades in the future.