Biofuels get a lot of good press, but supplies of fuel crops will never be as large as our solar energy resources.
Solar is a promising source of future energy supplies because not only is it clean, it’s remarkably abundant.
In the United States, most oil is used for transportation. Dwindling world oil supplies already have many people worried about future prices.
The popularity of hybrid electric cars is an encouraging sign that there are practical, appealing solutions to the problem of how to use less energy.
Wind power is a clean-burning source of electricity, and has the potential to meet many of our future energy needs.
Most of the electricity in the United States comes from coal, but burning coal produces a lot of pollution, including carbon dioxide, mercury and sulfur emissions.
Left: Annual global renewable energy resources, 725 million terrawatt hours. Right: Total global non-renewable energy resources, 10.8 million terrawatt hours. Click here for a larger image with specific energy resource numbers.
MATTHEW T. STALLBAUMER
At current rates of consumption, world oil supplies are only projected to last for another 40 years.
With building-integrated photovoltaics, homes and offices can actually produce more energy than they consume.
DC POWER SYSTEMS
World supplies of solar energy are virtually inexhaustible, and can be tapped using current technology. Will solar power lead us to a brighter future?