Beginning of 21st century, year 2008, spaceship flying over Meirama power station

Marcial: Why did they use those polluting fuels?

Retocho: In the beginning of the 21st century, energy was produced by burning fossil fuels like oil, coal and gas.

Palmira: But burning them produced polluting gases like CO2 and acid rain.

Retocho: They also needed to be transported to the power stations, with a high risk for the oceans and the danger of oil slicks.