Testing Ourselves

You all know young David! He is now a senior antenna engineer. He successfully calibrated many antennas found in his company´s warehouse [1], and designed and realized a highly effective rooftop antenna-tracking system [2]. He is now concerned with climate change, and is interested in green energy (in other words, renewable energy, alternative energy, or clean energy) problems. This is and will continue to be a hot political/social/economic issue [3]. The term green energy is used to describe sources of energy (e.g., geothermal, wind, solar, and hydro) that are considered to be environmentally friendly and less polluting.