Aging population, warming climate is recipe for disaster

A person in their 40s now will be nearing 70 in the year 2050. And they won't be alone, because the world is undergoing an unprecedented and inexorable shift: by 2050, scientists project, more than 20% of Earth's population will be over 60.That demographic shift coincides with another major change: the Earth heating up because of human-caused climate change.

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