More than 3 billion people could end up living in extreme heat in the not so distant future.<br />A new study showed that the unbearable heat could encompass regions of the world in the next 50 years.<br />The actual number of people affected by the climate change depends on how fast the global population grows.<br />The other key factor in how fast the staggering temperatures engulf the globe is related to levels of carbon emissions.<br />20 million people worldwide currently live in regions with extreme high temperatures.<br />Researchers found that parts of Africa, Asia, South America, and Australia are likely to see an increase in the next 50 years.
