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answer 2 most likely, though there are other sources of plastics.
outer screw-in yoke
Future technology is likely to be more advanced in terms of artificial intelligence, robotics, automation, virtual and augmented reality, bioengineering, and renewable energy sources. It could include innovations such as self-driving cars, smart homes, wearable technology, advanced medical treatments, and sustainable infrastructure. Overall, the goal of future technology would be to enhance efficiency, convenience, sustainability, and improve the quality of life for individuals and society as a whole.
Alternating current is a flow of electrical energy in which the direction of electron flow reverses periodically. The mains electricity in your house is likely Alternating Current. The other form is Direct Current, where the direction of electron flow is in one direction only. Such as the flow from the batteries in your flashlight.
If you are talking about operating costs, it would depend on the prices of the energy sources and the efficiencies of the heaters in question. You must compare the efficiency ratings of the two heaters in question and then calculate the cost of using them in your particular application. As far as unit purchase costs and installation costs, it depends on what units you are considering for installation. Right now, in North America, at least, and likely elsewhere as well, the cost of heating with fossil fuels is becoming more and more expensive than heating with electricity.
Biomass is likely to increase in importance as a fuel source as we continue to try to move towards renewable sources of energy.
Geothermal --novanet
Ethanol, hydroelectricity, and solar power are renewable resources that are not likely to run out in the next 200 years.
Difficult to know what this means. Natural renewable energy sources are wind and solar mainly, tidal and waves may be developed as well. However these are more likely to replace coal burning than nuclear, I should think.
Moving to renewable energy for electricity would extend the Earth's supply of the fossil fuel oil.
Ethanol, hydroelectricity, and solar power are renewable resources that are not likely to run out in the next 200 years.
Its cheaper. Its less likely to get damaged, and more people are trained to fix problems with non-renewable energy systems.
You may want to try The Daily Energy Report. It is a pool of authors of experts in the energy industry.
Mankind is in agreement that the sustainable future energy must be the renewable source e.g. hydro-power, solar energy (Photo-voltaic, Thermo-electric), wind energy, wave energy or biologically derived biofuel. However, the bridging gap from fossil fuel to fully renewable energy is in struggle by cost of renewable and environmental impact issues. It is likely that mankind had to depend on alternative depleting energy like Nuclear power for quite a periods of time before achievement of renewable society.
At present it is no kind of energy source and unlikely to be for many years to come. Technically it would be non-renewable, but the raw material is the most common element in the universe so that's not likely to be an insurmountable problem.
nuclear
geothermal