Such an interesting article!
Apparently, the Caribou Time breeding and birth to an internal clock tied to the sun/not air temp.
So, the warming is bringing Spring earlier and food for the birthing females is already getting scarce at delivery time. Plants rely on air temp as to when they come alive. In addition, big mosquitos are out due to the earlier warm temps. They can cause disease in the young.
Hope the link to the article below works.
https://www.theatlantic.com/science/...change/405322/