Scientists have already warned that climate change likely will impact the food we grow. From rising global temperatures to more frequent "extreme" weather events like droughts and floods, climate change is expected to negatively affect our ability to produce food for a growing human population.

But new research is showing that climate change is expected to accelerate rates of crop loss due to the activity of another group of hungry creatures — insects. A paper published Aug. 31 in the journal Science reports that insect activity in today's temperate, crop-growing regions will rise along with temperatures. Researchers project that this activity, in turn, will boost worldwide losses of rice, corn and wheat by 10-25 percent for each degree Celsius that global mean surface temperatures rise. Just a 2-degree Celsius rise in surface temperatures will push the total losses of these three crops each year to approximately 213 million tons.

During the 2017–18 academic year, SPICE’s Jonas Edman worked with six community college instructors from Las Positas College and Foothill College on their plans for integrating global issues into their classrooms. These six instructors were among ten Education Partnership for Internationalizing Curriculum (EPIC) Fellows to work collaboratively with colleagues at Stanford on projects aimed at internationalizing course curricula and producing innovative curricular materials for use in community college classrooms.

On May 19, 2018, an EPIC Symposium, “Integrating Global Issues into Community College Curricula,” was held at Stanford University that featured presentations by the EPIC Fellows as well as presentations from Stanford faculty. Community college faculty and administrators from across California gathered at Stanford University to discuss ways to prepare students for a world that is increasingly interconnected.

The six EPIC Fellows, with whom Edman worked, and their presentation topics are:

• Brian Evans, Foothill College: The Latin American Lost Decade
• Ann Hight, Las Positas College: Using Global Lifestyles as a Platform to Teach Gene Expression and Longevity
• Natasha Mancuso, Foothill College: Using Online Games to Teach Business and Marketing from a Global Perspective
• Kali Rippel, Las Positas College: Internationalizing the Research Project Using Wikipedia
• Colin Schatz, Las Positas College: Globalized and Inclusive: Redesigning a Community College Honors Program
• Antonella Vitale, Las Positas College: Global Voices in American History

Since 2010, Stanford Global Studies (SGS) has partnered with community colleges through innovative projects such as the Stanford Human Rights Education Initiative (SHREI) and EPIC to bring together faculty and administrators committed to developing global and international studies. Fellows join a growing network of EPIC alumni from across the state who are developing innovative programs to internationalize curricula. SPICE as well as Stanford’s Lacuna Stories have been working with SGS National Resource Centers—Center for East Asian Studies, Center for Latin American Studies, Center for Russian, East European and Eurasian Studies—on these efforts.

There is plenty of research on how the rapid warming of the planet is going to have growing adverse impacts on global economies, health, food supplies and natural disasters.

A new study now suggests that as temperatures continue to rise — particularly with more and more 90-plus-degree days — more fetuses and infants will experience economic loss by age 30.

“There is a growing body of evidence that finds that shocks to the fetus and young child — whether nutritional, environmental, economic or stress-related — have long-term consequences on health, education and economic outcomes throughout the life cycle,” said Maya Rossin-Slater, an assistant professor of health research and policy at Stanford Medicine and a faculty fellow at the Stanford Institute for Economic Policy Research.

Rossin-Slater published her study Dec. 4 in the Proceedings of the National Academy of Sciences, indicating early-life exposure to extreme temperatures is linked to potential losses in human capital. Her co-authors are Adam Isen, an economist with the U.S. Department of Treasury, and Reed Walker, an assistant professor at University of California, Berkeley.

The researchers used data from the U.S. Census Bureau’s Longitudinal Employer Household Dynamic Files, which contain information on adult labor market outcomes linked to county and exact date of birth. They looked at weather in counties in 24 states on any given day, and then measured how many days with average temperatures above 90 degrees a child born on that day in that county would have experienced during gestation and during the first year of life. They then compared the earnings of individuals who were exposed to different numbers of such hot days, but who were of the same race and gender, and born in the same county and on the same day of the year (but in different years).

Each day a fetus or infant experiences 90-plus-degree temperatures, Rossin-Slater and her co-authors found that he made $30 less a year on average, or $430 over the course of his lifetime. While that may not seem like a huge loss of income, the authors point out that their study is best understood from a population-level perspective rather than from an individual one.

“There is a lot of research already showing that extreme heat has immediate effects on labor market productivity and GDP,” she said. “What we are saying is that there is another wrinkle to this — that there can be consequences many years later, on cohorts who are still in the womb.”

Most Americans today only experience one day a year that is 90 degrees or hotter. But the Climate Impact Lab has indicated that if countries continue to take only moderate action on climate change, by the end of this century there will be about 43 such days a year.

So, if you multiple a $30 annual loss a day by 43 days, you come up with an average $1,290 a year — and compounded in large populations of pregnant women in hot climates.

“Prior research shows that exposure to extreme heat in utero leads to lower birth weight and increases infant mortality,” said Rossin-Slater, who is also a core faculty member at Stanford Health Policy. She said poor fetal and infant health could impact adult earnings in three ways: cognitive impairment, poor health that causes people to miss school or work, and less non-cognitive skill development such as self-control.

“With regard to exposure to heat specifically, fetuses and infants are especially sensitive because their thermoregulatory systems are not fully developed and they have less capacity to self-regulate when their bodies are exposed to extreme temperatures,” Rossin-Slater said.

Hot Zones and Air Conditioners

The obvious questions that arise from such research: What happens to the babies of women who already live in very high temperatures? And why not just ensure that all pregnant women have air conditioners, at least in the developed world where it would be more affordable?

Women in warm zones such as parts of Africa and South Asia, as well as U.S. cities like Phoenix and Washington, D.C., shouldn’t worry too much. The loss of income is relatively little and people living in hot climates may actually adapt over time to exposure to extreme heat.

“Our study is not saying that individual people should be doing something differently to avoid exposure to extreme heat,” Rossin-Slater said. “Instead, we think we are providing additional evidence for the possible population-level consequences of climate change and the projected increase in the number of days with extreme temperatures.”

And what about those air conditioners? The cohorts in the study are actually born in the 1970s, during a period of rapid expansion in air conditioning across American households. The researchers found the earning losses went away in areas where most people got air conditioners installed.

“If we think that there is something biological going on as a result of the fetus being overheated, then it makes sense that AC, which prevents the overheating, can mitigate this negative effect,” Rossin-Slater said.

But it’s important to recognize, she said, that air conditioners come with costs, both financial from the perspective of individuals and households who can and can’t afford such systems, and environmental from the perspective of the country or planet as a whole.

“So this is not a `free’ solution and any cost-benefit calculations related to climate change should take into account this adaption response,” Rossin-Slater said. “But we ought to think about what these results imply at the global level — in many countries that are much hotter than the United States and still don’t have AC. So if we are trying to understand global inequality and the impacts of climate change on developing countries, our results suggest that climate change could play a role in perpetuating global inequality across generations.”

In a shack that now sits below sea level, a mother in Bangladesh struggles to grow vegetables in soil inundated by salt water. In Malawi, a toddler joins thousands of other children perishing from drought-induced malnutrition. And in China, more than one million people died from air pollution in 2012 alone.

Around the world, climate change is already having an effect on human health.

In a recent paper, Katherine Burke and Michele Barry from the Stanford Center for Innovation in Global Health, along with former Wellesley College President Diana Walsh, described climate change as “the ultimate global health crisis.” They offered recommendations to the new United States president to address the urgently arising health risks associated with climate change.

Bangladeshi children make their way through flood waters.

The authors, along with Stanford researchers Marshall Burke, Eran Bendavid and Amy Pickering who also study climate change, are concerned by how little has been done to mitigate its effects on health.

“I think it’s likely that health impacts could be the most important impact of climate change,” said Marshall Burke, an assistant professor of earth system science and a fellow at the Freeman-Spogli Institute for International Studies.

There is still time to ease — though not eliminate — the worst effects on health, but as the average global temperature continues to creep upward, time appears to be running short.

“I think we are at a critical point right now in terms of mitigating the effects of climate change on health,” said Amy Pickering, a research engineer at the Woods Institute for the Environment. “And I don’t think that’s a priority of the new administration at all.”

Health effects of climate change

Even in countries like the United States that are well-equipped to adapt to climate change, health impacts will be significant.

“Extremes of temperature have a very observable direct effect,” said Eran Bendavid, an assistant professor of medicine and Stanford Health Policy core faculty member.

“We see mortality rates increase when temperatures are very low, and especially when they are very high.”

Bendavid also has seen air pollutants cause respiratory problems in people from Beijing to Los Angeles to villages in Sub-Saharan Africa.

“Hotter temperatures make it such that particulate matter and dust and pollutants stick around longer,” he said.

In addition to respiratory issues, air pollution can have long-term cognitive effects. A study in Chile found that children who are exposed to high amounts of air pollution in utero score lower on math tests by the fourth grade.

“I think we’re only starting to understand the true costs of dirty air,” said Marshall Burke. “Even short-term exposure to low levels can have life-long effects.”

Low-income countries like Bangladesh already suffer widespread, direct health effects from rising sea levels. Salt water flooding has crept through homes and crops, threatening food sources and drinking water for millions of people.

“I think that flooding is one of the most pressing issues in low-income and densely populated countries,” said Pickering. “There’s no infrastructure there to handle it.”

Standing water left over from flooding is also a breeding ground for diseases like cholera, diarrhea and mosquito-borne illnesses, all of which are likely to become more prevalent as the planet warms.

On the flip side, many regions of Sub-Saharan Africa — where clean water is already hard to access — are likely to experience severe droughts. The United Nations warned last year that more than 36 million people across southern and eastern Africa face hunger due to drought and record-high temperatures.

Residents may have to walk farther to find water, and local sources could become contaminated more easily. Pickering fears that losing access to nearby, clean water will make maintaining proper hygiene and growing nutritious foods a challenge.

Climate change will affect health in all sectors of society.

All of these effects and more can also damage mental health, said Katherine Burke and her colleagues in their paper. The aftermath of extreme weather events and the hardships of living in long-term drought or flood can cause anxiety, depression, grief and trauma.

Climate change will affect health in every sector of society, but as Katherine Burke and her colleagues said, “….climate disruption is inflicting the greatest suffering on those least responsible for causing it, least equipped to adapt, least able to resist the powerful forces of the status quo.

“If we fail to act now,” they said, “the survival of our species may hang in the balance.”

What can the new administration do to ease health effects?

If the Paris Agreement’s emissions standards are met, scientists predict that the world’s temperature will increase about 2.7 degrees Celsius – still significant but less hazardous than the 4-degree increase projected from current emissions.

The United States plays a critical role in the Paris Agreement. Apart from the significance of cutting its own emissions, failing to live up to its end of the bargain — as the Trump administration has suggested — could have a significant impact on the morale of the other countries involved.

“The reason that Paris is going to work is because we’re in this together,” said Marshall Burke. “If you don’t meet your target, you’re going to be publicly shamed.”

The Trump administration has also discussed repealing the Clean Power Plan, Obama-era legislation to decrease the use of coal, which has been shown to contribute to respiratory disease.

“Withdrawing from either of those will likely have negative short- and long-run health impacts, both in the U.S. and abroad,” said Marshall Burke.

Scott Pruitt, who was confirmed today as the head of the Environmental Protection Agency (EPA), is expected to carry out Trump’s promise to dismantle environment regulations.

Despite the Trump administration’s apparent doubts about climate change, a few prominent Republicans do support addressing its effects.

Secretary of State Rex Tillerson, the former chairman and CEO of Exxon Mobile, supports a carbon tax, which would create a financial incentive to turn to renewable energy sources. He also has expressed support for the Paris Agreement. It is possible that as secretary of state, Tillerson could help maintain U.S. obligations from the Paris Agreement, though it is far from certain whether he would choose to do so or how Trump would react.

More promising is a recent proposal from the Climate Leadership Council. Authored by eight leading Republicans — including two former secretaries of state, two former secretaries of the treasury and Rob Walton, Walmart’s former chairman of the board — the plan seeks to reduce emissions considerably through a carbon dividends plan.

Already an issue, malnutrition will increase with droughts in Sub-Saharan Africa.

Their proposal would gradually increase taxes on carbon emissions but would return the proceeds directly to the American people. Americans would receive a regular check with their portion of the proceeds, similar to receiving a social security check. According to the authors, 70 percent of Americans would come out ahead financially, keeping the tax from being a burden on low- and middle-income Americans while still incentivizing lower emissions.

“A tax on carbon is exactly what we need to provide the right incentives and induce the sort of technological and infrastructure change needed to reduce long-term emissions,” said Marshall Burke.

Pickering added, “This policy is a ray of hope for meaningful action on climate.”

It remains to be seen whether the new administration and congress would consider such a program.

What can academics do to help?

Meanwhile, academics can promote health by researching the effects of climate change and finding ways to adapt to them.

“I think it’s fascinating that there’s just so little data right now on how climate change is going to impact health,” said Pickering.

Studying the effects of warming on the world challenges traditional methods of research.

“You can’t create any sort of experiment,” said Bendavid. “There’s only one climate and one planet.”

The scholars agree that interdisciplinary study is a critical part of adapting to climate change and that more research is needed.

“If ever there was an issue worthy of a leader’s best effort, this is the moment, this is the issue,” said Katherine Burke and her colleagues. “Time is short, but it may not be too late to make all the difference.”