In the U.S., cancer rates are going up—especially for young and middle-aged women, whose cancer diagnoses have surpassed those of men. Women under 50 are now almost twice as likely to develop cancer than men of the same age,

As temperatures rose in more than a dozen Middle Eastern and North African countries over the past two decades, cancer mortality among women did too, according to a new study.

"As temperatures rise, cancer mortality among women also rises -- particularly for ovarian and breast cancers," lead investigator Wafa Abu El Kheir-Mataria said in a news release. She's a global health governance and health equity researcher at the American University in Cairo.