Go through the readings to find the answers to the questions listed below. Roug

Go through the readings to find the answers to the questions listed below.
Roughly around 100 words for each response.
The material used for questions:
“Coal” Available at https://www.need.org/Files/curriculum/infobook/CoalI.pdf (Links to an external site.)
“Cradle to Grave: The Environmental Impacts from Coal” Available at https://www.csu.edu/cerc/researchreports/documents/CradletoGrave-TheEnvironmentalImpactsFromCoal2001.pdf (Links to an external site.)
“Synthetic Natural Gas (SNG): Technology, Environmental Implications, and Economics” Available at https://nicholasinstitute.duke.edu/sites/default/files/publications/natgas-paper.pdf (Links to an external site.)
“Tar Sands Invasion” is available at https://www.nrdc.org/sites/default/files/TarSandsInvasion-full.pdf (Links to an external site.)
Questions:
1. Why is coal an important energy source?
2. What are the environmental impacts of coal?
3. Should we invest in synthetic gas as the energy of the future?
4. Tar sands are harmful to the US economy. Why or Why not?