Throughout this section, we've seen how the most important fuels pollute the environment and contribute to much of the world's greenhouse gas emissions. Now think of a fuel that has the following ideal properties: it is available in large quantities throughout the planet, we know how to extract it from its main source(s), and the products of its combustion are entirely clean. Identify this substance.
A. Hydrogen
B. Solar Power
C. Wind Energy
D. Nuclear Fusion
