Freelance writer Marlene Cimons is a former Washington reporter for the Los Angeles Times who specializes in science and medicine. She writes regularly for the National Science Foundation, Climate Nexus, Microbe Magazine, and the Washington Post health section, and she is an adjunct professor of journalism at the University of Maryland, College Park. Cimons contributed this article to LiveScience's Expert Voices: Op-Ed & Insights.

For months after Hurricane Sandy sent nearly six feet of water surging into her home in Long Beach, N.Y. — an oceanfront city along Long Island' s south shore — retired art teacher Marcia Bard Isman woke up many mornings feeling anxious and nauseated. She had headaches, and inexplicable bouts of sadness. She found herself crying for no apparent reason.

"I would feel really sad, and that's just not me," she said. "I felt like the joy was out of my life. I still haven't recaptured it."

What Isman is experiencing is one of the little-recognized consequences of climate change, the mental anguish experienced by survivors in the aftermath of extreme and sometimes violent weather and other natural disasters. The emotional toll of global warming is expected to become a national — and potentially global — crisis that many mental health experts warn could prove far more serious than its physical and environmental effects.

"When you have an environmental insult, the burden of mental health disease is far greater than the physical," said Steven Shapiro, a Baltimore psychologist who directs the program on climate change, sustainability and psychology for the nonprofit Psychologists for Social Responsibility (PsySR). "It has a much larger effect on the psyche. Survivors can have all sorts of issues: post traumatic stress disorder, depression, anxiety, relationship issues, and academic issues among kids."

A report released in 2012 by the National Wildlife Federation's Climate Education Program and the Robert Wood Johnson Foundation predicted a steep rise in mental and social disorders resulting from climate change-related events in the coming years, including depression and anxiety, post-traumatic stress disorder, substance abuse, suicide and widespread outbreaks of violence. Moreover, it estimated that about 200 million Americans will be exposed to serious psychological distress from climate-related events in the coming years, and that the nation's counselors, trauma specialists and first responders currently are ill-equipped to cope.

"The physical toll has been studied, but the psychological impacts of climate change have not been addressed," said Lise Van Susteren, a forensic psychiatrist and one of the report's authors. "We must not forget that people who are physically affected by climate change will also be suffering from the emotional fallout of what has happened to them. Others suffer emotionally from a distance, especially those who are most keenly aware of the perils we face, or as in the case of children, those who feel especially vulnerable. And the psychological damage is not only over what is happening now, but what is likely going to happen in the future.

"This kind of anticipatory anxiety is especially crippling and is increasingly being seen among climate activists — in some cases rising to the level of a kind of 'pre-traumatic' stress disorder," she added.

Moreover, society can expect to experience a collective sense of sadness, anger and defeat as it confronts the inevitable, and possibly irreversible, long-term environmental effects of global warming, and the failure to prevent them, according to Van Susteren.

"We are undoing millions of years of evolution, and the situation is a catastrophe," she said. "Climate activists on the front lines are desperate to convey this to the public, but are told to be wary of paralyzing people with fear. Compounding the issue is that people often generally are not 'good' at knowing they are anxious, or, if they do, often don't know why.

"Because of the magnitude of the problem, and the fact that our leaders are not responding commensurate with the threat, feelings of vulnerability are repressed and cause unseen psychological damage," she added.

The report emphasized that certain populations would be more at risk than others, including the elderly, the poor, members of the military, people with pre-existing mental-health disorders, and especially America's 70 million children.

The report compared what children may be feeling today to the distress suffered by American and Russian children over the threat of the nuclear bomb in the 1950s during the Cold War era, saying that climate change could have the same destructive impact. "Some children are already anxious about global warming and begin to obsess, understandably, about the future, unmoved by the small reassurances adults may attempt to put forth," the report said.

The report recommendedthat the federal government draft a plan to enact a large-scale response to the mental-health effects of global warming, including public-education campaigns, increased training for mental-health professionals, and developing mental-health incident response teams.

Despite the nation's experiences with previous natural disasters, "the scientific data show that what lies ahead will be bigger, more frequent, and more extreme than we have ever known," prompting potentially dire mental-health impacts, the report warned.

"Many people will experience an inordinate risk and their minds will be changed because of it," Shapiro said. . "Although some people may come out of it stronger, experiencing a trauma can totally change the way you function."

A striking image of Verrazano Bridge in Brooklyn as Hurricane Sandy approaches on Oct. 29, 2012. (Image credit: Carlos Ayala

Isman certainly would agree. "Initially, I was numb, running on adrenaline," she said.

"There was a delayed reaction. I didn't realize what was going on with me emotionally."

For starters, she and her husband, Michael Clark, had to cope with $125,000 worth of damage to their house and the loss of two cars. "When the surge hit, I was standing on the steps to my basement and heard this roar," she said. "I looked toward the sound and, literally, a wave of water came into the basement. Within two minutes the basement was nearly filled to the ceiling. It stopped at the second step before my kitchen."

The couple spent the first week after Sandy camped out in a dark, cold house without water, electricity, or working toilets. After that, they moved in with friends until their toilets were functioning again. Still, living conditions were extremely difficult. The hurricane had wrecked the local sewage plant, contaminating the flood waters that entered her basement. Also, Long Beach imposed a curfew, and blocked bridge access into the city to prevent looting. "No one was allowed in without an ID," Isman said. "The rules were necessary and kept us safe, although at the same time, it did make things more complicated and stressful."

Yet, as bad as it was for Isman, it was far worse for others. Nearly 300 people died, and many lost their homes permanently. This knowledge weighed heavily on Isman, who felt guilty about her own emotional reactions. "I thought I had no right to feel what I was feeling because my situation wasn't as bad as theirs," she says. She found solace at a local Hurricane Sandy support group formed shortly after the disaster.

Isman's emotions "were all normal reactions to a life-shattering situation," says Dr. Laurie Nadel, a psychotherapist who started the group and who lost her own Long Beach home to the storm. "I knew there was a need for a safe place for people to come and talk about what they were going through. It can be very isolating. You need a place where you can share and normalize your experiences with other people."

Members of Psychologists for Social Responsibility worry that continued inaction on climate change will only bring more of the same. The group recently wrote to Congress, urging lawmakers to address climate change to avoid a mental health catastrophe.

"Without such action, the impact of heat waves, extreme storms and floods, droughts and water shortages, food production problems, lessened air quality, sea level rise, and displacement from homes and communities is likely to pose significant mental-health challenges to millions of Americans and billions of others worldwide," the psychologists wrote in their letter.

The resulting stress and rise in mental illness likely will "harm interpersonal relationships, make people less able to work constructively or do well in school, and ultimately injure the day-to-day functioning of our society and our economy," the group told Congress. "Hurricane Katrina demonstrated all of these outcomes in microcosm to the American people, and an ample body of research strongly predicts such severe psychological and social consequences."

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To be sure, while it is possible for survivors to recover emotionally, "there is significant sudden loss that needs to be processed," Nadel said. "There is physical loss, there is emotional loss, and there is social loss."

Meanwhile, if the world's nations do not contend aggressively with the dangers posed by a warming planet, "we will have to deal with the reality that we are living in unpredictable, unstable and volatile times when it comes to climate change," Nadel said. "When I talk to people in other countries who've been living with natural disasters their whole lives, they don't expect the phones to always work, and they understand that people may not show up on time because a tree might have fallen on the road. They accept that emergencies are part of life and out of their control.

"Their social rhythms have adapted, and that's what we're going to have to do," she added. "We will have to shift our mindset to accepting uncertainty and unpredictability, and develop a different belief system about what we'll have to contend with when the order of things changes."

The author's most recent Op-Ed was "The Microbes in Your Gut May be Making You Fat." The views expressed are those of the author and do not necessarily reflect the views of the publisher. This version of the article was originally published on LiveScience.