An innovative start-up in Egypt provides a means for local farmers to use clean solar energy on their farms.
Only when the unsubsidized cost of clean energy is cheaper than fossil fuels will nations switch en masse.
This century is witnessing a shift to renewable solar and wind energy.
President Obama has set ambitious carbon emission goals for the United States. Can it rise to the challenge?
Is the United States reducing its odds of discovering the next technological and economic game-changer?