Alternative source of kinetic energy

We can use the movement of cars on the road to make a machine that can absorb carbon dioxide which can help SAVE THE EARTH.

Alternative Source of Electrical Energy

Alternate sources of energy:

The first option we could use is hydro-electric energy which seems to be expensive but much more convenient than that of a windmill as the wind is unpredictable resulting to a unsteady supply. Hydro-electric energy are much more constant as the water will be rushing at it most of the time - unless there is a drought of course. 
The other source would be the wind mill.Yes, it has an unsteady supply but it is much CHEAPER than Solar energy. And it's enviromentally friendly too! (well, it should be...)
Moving on, We have the Solar panels. Solar energy is good and enviromentally freindly but what's that? Yes, it is VERY EXTREMELY EXPENSIVE. And, we need a great amount of solar energy to have an adequate amount of electricity. Another fault, at night, we won't get any energy, unless there's a device which saves the electricity of course!!! 
So what should we do is there's not enough electricity? Two answers:
1) Use less electricity!
2) Combine the electricity from the alternate sources!

Fauzia's note: Hello! I managed to sneak on to the computer to do this!Anyway, If I did something on my answer that shouldn't be there, please tell me! Thank you!