As bad days go, it's hard to top the one 66 million years ago when a space rock the size of Paris slammed into Earth at 45,000 miles per hour.The heat of impact generated massive fires that annihilated everything around them and sent colossal plumes of pollutants soaring into the atmosphere.Within a day or two, toxic clouds of pulverized rock, sulfate aerosoles and wildfire soot had blanketed the planet, blocking all but a tiny fraction of the sun's energy and bringing photosynthesis to a virtual halt for the only known time in history.
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