Are Electric Cars going to be worth it?

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I just want to know what people are thinking about the new completely electric cars that are starting to come out. Personally I don't think they are all that practical, sure in places like India or anywhere with a warm climate i suppose, but what about cold climate locations. Having an electric heater would suck up all the battery life. Well.. what happens when everyone plugs their cars in at night? Now there is huge demand on our power stations which many still run on coal. how is that any better? Personally i rather see dirty cars getting pulled off the road and replaced with normal cleaner cars, and getting coal burning plants shut down. The electric cars wont replace people's cars if they are big highway drivers, it's going to be a replacement for people who drive short distances in the cities and probably use small efficient cars anyways! To me this is all media making it sound like it's some great thing but in actuallity it's not all that practical and wont even put a dent into our total emissions. What do you think my friend on this subject.