History shows Earth’s climate goes through cycles, long and short, tied to a variety of natural factors. In the latter part of the 20th century, some scientists began to wonder about the causes of a modest warming, then cooling, then warming, which had been occurring since the mid-1800s. They also began to worry about the possible implications of continued warming.
With roughly 20 percent of the world’s population without electricity, one of the greatest challenges that humanity will face this century is improving access to affordable, reliable energy. Vast amounts…