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\title{We are Margaret Kosmala, Koen Hufkens, and Josh Gray, climate change
researchers at Harvard and Boston University who are using automated
cameras, satellites, and citizen science to learn more about how future
climate change will impact plants across North America. AMA!}



\author[1]{Seasonspotter }%
\author[1]{r/Science AMAs}%
\affil[1]{Affiliation not available}%


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  \date{April 24, 2026}


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\begin{abstract}
Hi Reddit, We're Margaret Kosmala and Koen Hufkens at Harvard University
and Josh Gray at Boston University. We're part of a research group that
has been putting automated cameras on weather towers and other elevated
platforms to study the the seasonal timing of changes in plants, shrubs,
and trees -- called `phenology'. Because this timing of when plants
leaf, flower, and fruit is very sensitive to changes in weather, plant
phenology alerts us to changing climate patterns. Our network of about
300 cameras ('PhenoCams') take pictures of vegetated landscapes every
half hour, every day, all year round. (That's a lot of pictures!) With
the data from these images we can figure the relationships between plant
phenology and local weather and then predict the effects of future
climate using models. We also use images from satellites to broaden the
extent of our analyses beyond the 300 specific sites where we have
cameras. And we use citizen science to help turn our PhenoCam images
into usable data, through our Season Spotter project. Anyone can go to
Season Spotter and answer a few short questions about an image to help
us better interpret the image. Right now we are running a ``spring
challenge'' to classify 9,500 images of springtime. With the results, we
will be able to pinpoint the first and last days of spring, which will
help calibrate climate change models. UPDATE: We're done with our Season
Spotter spring images, thanks! Since it's fall in half the world, we've
loaded up our fall images. We have another 9,700 of those to classify,
as well. We'll be back at 1 pm EDT (10 am PDT, 6 pm UTC) to answer your
questions; we're looking forward to talking to you about climate change,
plants, and public participation in science! UPDATE 1 pm Eastern: We're
now answering questions! UPDATE 3 pm Eastern: Josh has to leave for a
meeting. But Koen and Margaret will stick around and answer some more
questions. Ask away if you have more of them. UPDATE 5 pm Eastern: Koen
and I are done for the day, and we've had a lot of fun. Thank you all
for so many insightful and interesting questions! We'll try to get to
more of the ones we missed tomorrow.%
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