Relative dating for fossils
Combustion of these fossil fuels is considered to be the largest contributing factor to the release of greenhouse gases into the atmosphere.
In the 20th century, the average temperature of Earth rose 1 degree Fahrenheit (1°F).
It’s not so much that we mine fossil fuels for our consumption any more than it is to mine salt or tap water supplies way underground.
The problems occur when we destroy ecosystems while mining it and while using it.
The enthusiasm everyone shares for these developments has in many ways created a sense of complacency that our future energy demands will easily be met.
This means that fossil fuels, along with nuclear energy — a controversial, non-renewable energy source — are supplying 93 percent of the world’s energy resources.
Dams are a major source of hydroelectric energy, such as the Hoover Dam on the Colorado River (pictured).
The Hoover Dam is a major source of energy for the southwestern US.
(Photo: US Bureau of Reclamation) Nuclear energy, which is primarily generated by splitting atoms, only provides 6 percent of the world’s energy supplies.
The total world energy demand is for about 400 quadrillion British Thermal Units — or BTUs — each year (Source: US Department of Energy). A BTU is roughly equal to the energy and heat generated by a match.