Climate change: Summers could become 'too hot for humans'

Millions of people around the world could be exposed to dangerous levels of heat stress - a dangerous condition which can cause organs to shut down. Many live in developing countries, and do jobs that expose them to potentially life threatening conditions.These include being out in the open on farms and building sites or indoors in factories and hospitals. Global warming will increase the chances of summer conditions that may be "too hot for humans" to work in.

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