How to make a windmill to produce electricity?

Have any ways to produce electricity?

• post here any ways you think we can make to produce electricity without harming the environment, even if they are weird, or something i have my own too but i think they are also impossible having rooftops have solar panels on them (but i think some of the heat may hit things) uhm, since carbon traps heat, how about putting a sort of plate with carbon and put it on a tower or something and then it will trap the heat and then we can use it as electricity. ok, this one sounds weird, but if it is possible, then we can lessen global warming right? i think .. everytime we use water, it goes down the drain. how about using all those water go through pipes that becomes narrower to make enough pressure to produce electricity (i also don't know about this, but i have a propeller that will spin when the water flows in mind) i know these are crazy, and i don't know why it even came into my thoughts. i have more but i think they are crazier than these,

• Answer:

  Your idea about the water pipes isn't a bad one, because we could eventually equip buildings with turbins that capture the energy of the falling water, not only from the sinks and showers, but rain water as well. Another idea I heard of recently that was really interesting and actually being put to use in Australia is that they're putting a several hundred meter tall chimney in the center of a really big green house. The chimney is narrower at the top than at the base. Temperature decreases about 1 degree celcius per 100 meters increase in altitude, this causes the relatively warm air of the green house to be sucked out really hard up the chimney. They then put wind turbins all along the chimney and harness the wind power. I guess in hot places like australia they can get quite a bit of electricity that way. My idea is to paint all the roof tops in every city white in really hot climates, and black in cold climates. That would drastically reduce the amount of energy needed and pollution produced running air conditioners and heaters. We should also plant more rooftop gardens where possible. Capturing rainwater in containers at the top of a building in a rainy place like Seattle for example, and using harvesting the energy of its fall could be a great source of energy too. Another one is to make all the machines at gyms produce power when people work out. For all these smaller scale energy production ideas we'll need really efficient devices, which I think are going to be much more available in the near future.