CNN: When climate scientist Rosina Bierbaum speaks, her central theme is the "roasted world" -- a bleak picture of what the planet will probably look like if carbon pollution continues unchecked, leading to 4 degrees Celsius of warming by mid-century.
Four degrees may not sound like a lot -- but it would change our lives drastically.
Mega-heat waves in 2010 in Europe and Russia were estimated to have caused up to 50,000 heat-related deaths, according to some reports. This "will become the normal,"...