greenhouse-gases

Current LED lamps are five times more efficient than incandescent lamps and have a much longer lifespan than compact fluorescent light bulbs. To evaluate a product’s true efficiency, however, its entire life must be taken into consideration, from manufacture through disposal.

On summer days, city air can be 5 or more degrees warmer than that in surrounding areas. Known as the “urban heat island effect,” it results in part from limited shade trees and the large surface area of pavement and dark roofing materials.

Over the past five years the price of oil has gone through wild swings — record highs are followed by more “normal” periods, sharp spikes alternate with modest troughs. Powering all this volatility is a complex mix of economics, political factors and industry developments.

Journalists, bloggers and communicators of all kinds often find themselves in a contentious debate over the truth behind global warming. The reasons that “skepticism” or “contrarianism” and the like persist in public discourse are numerous, and there is a great deal of research literature on this question.

Housing and automobiles in the United States generate almost 40% of the nation’s carbon dioxide emissions. Emissions vary with an area’s population density and weather patterns.  These in turn affect automotive and transit use, home heating, air conditioning and electricity usage.