Sorry, this is going to be a
very long post.
Global Warming, yes i do believe in it, although i dont believe human actions are necessarily the
sole cause.
We do need to do something about the human influence, since it appears to accelerate the natural temperature fluctuations (at some points in history, the earth has been warmer than now, at others colder).
Nuclear fusion isnt "clean" energy, while it doesnt generate greenhouse gases (like coal, oil and gas), it does leave us with radioactive waste, which can be just as harmful to the environment (if not more so). The same will be true of nuclear fission if/when scientists are able to safely and efficiently put the theory into practice.
Renewable energy sources can provide a large proportion of our energy needs:
- Solar power is a huge source of energy! Think of the number of buildings in the world: Homes, offices, factories, public services (schools, hospitals, emergency services, transport), etc - if solar panels were put on all that roof space...
- Ground source heating can be used in many places to heat and cool buildings, while being much more energy efficient than conventional heating and air-con systems.
- Wind power, while reliant on an unpredictable and sometimes unreliable source, is well suited for use in areas without connection to national electricity grids.
- Hydroelectric power is reliable and can generate vast amounts of energy, and is not just restricted to large scale projects like the Hoover or Yangtze dams, it can work effectively on a much smaller scale, as shown by many small villages in African countries.
- Others that i havent mentioned, such as wave, tidal and geothermal power, can also be used.
With a combination of all these sources, it should be possible to generate a large proportion of our energy requirements without resorting to fossil or nuclear fuels.
On a much smaller scale, as Arbiter pointed out, kinetic energy can be used, such as shaking and winding up torches, mp3 players, etc. There is even a laptop under development that can be kinetically powered (via a winding handle) , while this is aimed at "third world" countries, with advances in technology the generation system could be improved and utilized for many devices in the "first world".
Energy generation is only one point, there are many other aspects to consider:
- Increasing building insulation and energy efficiency, the amount of energy needed would be reduced, which could lead to less use of polluting energy sources.
- Dare i mention public transport, reducing reliance on private cars reduces pollution and resource usage (remember there is a fast running out supply of oil).
- "Reduce, Reuse, Recycle" - Reducing packaging, the amount of disposable products bought, Reusing products where possible (give unwanted items to charity shops or sell online *Ebay*), Recycling cans, bottles, paper, cardboard and other matter (this also saves energy since it requires less electricity to remake something from recycled material than to use raw material).
And that is just a few points, there are many other things that can (and should) be done.
If anyone wants me to provide links to anything ive mentioned, feel free to ask
EDIT: Its a shame the forum shop/bank doesnt work anymore, this post would have me very rich