Why Coal Mining is Bad?
Many people lost their lives in coal mines since widespread underground mining began in 18 century. Thousands of coal miners die from accidents annually around the world.
“One big difference between mining coal and other minerals such as copper or gold, is that coal inevitably comes with the potentially explosive methane gas.” from “Coal mining's invisible killer” article: http://www.theaustralian.com.au/news/features/coalminings-invisible-killer/story-e6frg6z6-1225957965701
"43 dead in China coal mine explosion: report": http://www.abc.net.au/news/2012-09-01/an-china-mine-explosion-death-toll-rises/4238028
"Coal’s Highest Price: 29 New Zealand Miners Die Underground": http://science.time.com/2010/11/24/coal%E2%80%99s-highest-price-29-new-zealand-miners-die-undergound/
"Chilean miners rescued after ten-week ordeal": http://www.wsws.org/articles/2010/oct2010/chil-o14.shtml
Why Nuclear Power is Bad?
Nuclear power can contaminate atmosphere, seas and rivers for hundreds of years, killing and destroying wildlife in the process:
Sunken Nuclear Submarines