I would choose non-polluting energy source and useful in remote areas - that is if there are plants and industries that are away from the general population.
Many aspects of today's society have been affected by ancient Rome . Creation of law, development of democratic government practices, influences in language, literature, art, infrastructure, and city-planning are all areas where the influences of Roman ideas can be seen.
I believe the answer would be C, burning fossil fuels. Oil and gas is made up of the remains of microscopic plankton. Over millions of years the remains become the carbon-rich coal, oil and gas we can use as fuel. When fossil fuels are burned they release carbon dioxide into the atmosphere, thus contributes to global warming.
