Global warming will change the lengths of the four seasons, a new study suggests, potentially making six-month-long summers the norm in the Northern Hemisphere by the year 2100.

In contrast, winters could last less than two months a year, while spring and autumn similarly shorter. These drastic seasonal changes would have wide-reaching impacts on the world, disturbing agriculture and animal behavior, increasing the frequency of heat waves, storms and wildfires, and ultimately posing “increased risks to humanity,” the study authors wrote.