The nature of witches
(Book)

For centuries, witches have maintained the climate, their power from the sun peaking in the season of their birth. Now their control is faltering; the atmosphere has become more erratic. All hope lies with Clara, an Everwitch whose rare magic is tied to every season. But her power is wild and volatile, and the price of her magic means losing the ones she loves. As the world nears disaster, she accepts that she's the only one who can make a difference. As she falls for Sang, the witch training her, Clara is terrified he will be the next one she loses. -- adapted from jacket