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\title{I'm Samuel Myers, senior research scientist at the Harvard T.H. Chan
School of Public Health. I study how our global transformation of
Earth's natural systems impacts human health and nutrition. AMA!}



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\author[1]{r/Science AMAs}%
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  \date{April 23, 2026}


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\begin{abstract}
Hello, reddit! I'm Samuel Myers, a senior research scientist in the
Department of Environmental Health at the Harvard T.H. Chan School of
Public Health and I'm here to talk about Planetary Health. As part of my
Planetary Health research, I lead five multidisciplinary research teams
investigating 1) the global nutritional impacts of rising concentrations
of CO2 in the atmosphere; 2) the health impacts of land management
decisions in SE Asia associated with forest fires and particulate air
pollution; 3) the nutritional impacts of reduced access to wildlife
(bushmeat) in the diet in Madagascar; 4) the local (in Madagascar) and
global consequences of fisheries decline for human nutrition and health;
and 5) the impact of animal pollinator declines on human nutrition at a
global scale. Planetary health is a growing field focused on
understanding the many ways that human transformation of all of Earth's
natural systems---the climate, oceans, land use, freshwater systems, and
other ecosystems---impacts human health. I recently authored two studies
in The Lancet that showed changing environmental conditions around the
globe caused by human activity could negatively impact the health of
millions of people by altering the amount and quality of key crops. One
study found that decreasing numbers of food pollinators such as
bees---falling in part due to pesticide use and destruction of
habitats---could lead to declines in nutrient-rich crops that have been
linked with staving off disease. A second study found that increasing
levels of atmospheric carbon dioxide (CO2) could lead to lower levels of
zinc in food and thus to greatly expanded zinc deficiency. You can read
an article about both of these studies here. If you are interested, you
can find some of my research articles, radio interviews (Living on
Earth, Morning Edition, Quirks and Quarks) and talks here. I'll be here
at 1:00 p.m. EST to answer your questions; ask me anything! Edit 2:45
p.m.: Unfortunately, I have to sign off now. Thank you so much for your
questions! I enjoyed chatting with you about this important topic. You
can always visit my website to stay up to date on the latest research
from me and my team.%
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