As the planet warms, mosquitoes are slowly migrating upward.

       The temperature range where malaria-carrying mosquitoes thrive is rising in elevation. Researchers have found evidence of the phenomenon from the tropical highlands of South America to the mountainous, populous regions of eastern Africa.

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       Scientists now worry people living in areas once inhospitable to the insects, including the slopes of Mt. Kilimanjaro and the mountains of eastern Ethiopia, could be newly exposed to the disease.

       “As it gets warmer at higher altitudes with climate change and all of these other environmental changes, then mosquitoes can survive higher up the mountain,” said Manisha Kulkarni, a professor and researcher studying malaria in sub-Saharan Africa at the University of Ottawa.