In Karachi, 17 million residents endure overlapping crises of toxic air, flooding, poor waste disposal and climate change.

It may not seem like a major factor, but as well as sunscreen and sensible clothing, what you consume can also impact your heat health.

When Julie Wang sees streets turn into rivers after another heavy downpour in Toronto, she thinks of the 600-square-foot patch of greenery on her roof — and feels a little less helpless.

The findings showed that climate change was behind 317 of the estimated excess heat deaths in Milan, 286 in Barcelona, 235 in Paris, 171 in London, 164 in Rome, 108 in Madrid, 96 in Athens, 47 in ...