1. Coal
By Emma, Pernille and Ak

2. Basics Consists primarily of carbon
Secondarily of hydrogen, sulfur, oxygen and nitrogen.
Provides half of the world‘s electricity
Coal-use has tripled since 1960

3. How coal was formed Dead plant submerged in swamp-environments
Under heat and pressure plants convert to lignite
Lignite converts into coal
It takes hundreds of millions of years for coal to form

4. How coal is mined Modern surface mining Seams near surface
Requires few workers
Uses large machinery
Covers large areas
Remove vegetation and soil from area
Sediment of rock is removed
Coal removed in strips
Restoration after mining process

5. Mountaintop-removal mining
Removal of mountaintop to reach coal seams
Coal is pushed down from the mountaintop
Leaves the mountains flat
Unpopular

6. Underground mining Room and pillar Longwall 50% of underground mining
Long tunnels
Support-system for roof when mining

7. Energy crisis Coal is cheap But… Pollution Accidents Climate change
Technology evolves
Debate:
Coal or…