The most realistic options for meeting the massive demand for energy in the world today and in the future (currently some 15 terrawatts of power) is either nuclear fission or solar power. All other alternatives simply do not have the capacity to scale up on the level which is required for global implementation (for a detailed analysis of this fact, see the Web Links to the left under "Dr. Nathan Lewis").
While nuclear power could provide sufficient energy to the world carbon free, it would require building a new nuclear power plant every other day for the next 50 years in order to meet demand. Not to mention the problems of national security and the unsolved issues with dangerous nuclear waste that will remain toxic for hundreds of thousands of years.
Solar energy on the other hand has tremendous potential. FACT: MORE ENERGY FROM THE SUN HITS THE SURFACE OF THE EARTH IN ONE HOUR THAN THE ENTIRE WORLD USES ALL YEAR. There are vast supplies of energy in sunlight. The problem with solar energy currently is the cost -- solar cells are simply not economically competitive with other ways of making electricity from fossil fuels (in particular coal). Much more research and development must be done to reduce this cost. The other big problem with solar energy is that currently most solar cells only make electricity, which is difficult to store efficiently. Each night, the sun goes down, and you must have a way to store the energy you will need for the night. Charging and discharging batteries is a very inefficient way to do that. There are solar cells which can produce chemical fuels directly instead of electricity (such as water splitting solar cells that can directly electrolyze water to hydrogen and oxygen). These cells also need a great deal of further research and development before they can be used on a large scale.
See the Related Question links to the left: "What are some alternate sources of energy?"
Most, if not all of the sources of energy listed there are so-called "carbon neutral." Many do not emit any carbon dioxide at all (e.g. solar, geothermal, wind, tides/waves, nuclear), but those that do (biomass) remove as much CO2 from the air as they emit, so that the net is zero.
Renewable energy takes the energy of the sun and turns it into electricity. Examples of renewable energy are hydropower, solar power, wind, wave and water power, geothermal (using heat from the centre of the earth) and various forms of biofuels.
Nuclear power is non-renewable, but it does not emit carbon dioxide.
Using renewable energy sources like solar, wind, hydro, tide and wave power, geothermal and biofuel releases no carbon dioxide emissions.
Solar Energy, Solar Panels. Wind Energy, wind turbines. Water, that is used to turn turbines like those in the Hoover Dam as well.
Greenhouse gases.
it allows solar radiation to penetrate to the surface!
The greenhouse gases contribute to the greenhouse effect. Greenhouse gases are inescapable.
There are no greenhouse gases in cow manure, but methane is easily produced from manure if it decomposes anaerobicly (without oxygen).
No. Greenhouse gases in the atmosphere capture heat, and heat is energy, but we have no way of using this energy for ourselves as fuel. This extra energy in the atmosphere will be expended in more severe weather, like storms and cyclones.
In the atmosphere
No, it is not.
Greenhouse gases.
Without greenhouse gases keeping the planet warm we would all be frozen, yes, and die.
By using windmills to produce energy, it cuts down on energy produced via fossil fuels such as coal and oil which produce greenhouse gases. Greenhouse gases are the main causes of global warming. Basically, using windmills to make clean energy cuts down on the production of greenhouse gases.
The Sun is the source of energy. Heat from the sun radiates up from the surface of the earth and warms the greenhouse gases.
it allows solar radiation to penetrate to the surface!
Greenhouse gases are very light but they change how sunlight is reflected back out into space in that greenhouse gases do not allow as much sunlight to be reflected. This increases the amount of energy held within the atmosphere and warms the planet
Greenhouse Gasses
The greenhouse gases contribute to the greenhouse effect. Greenhouse gases are inescapable.
There are no greenhouse gases in cow manure, but methane is easily produced from manure if it decomposes anaerobicly (without oxygen).
Visible light passes through the atmosphere readily with little absorption. This light energy hits the surface of different materials and the planet itself. Some of this energy is converted into thermal energy which can more readily be absorbed by the greenhouse gases. Water vapor, the most common greenhouse gas is able to dispel this energy through rain, and the other gases keep us alive and warm through the night. Without greenhouse gases, we would be unable to survive on this planet.