There are *one billion* cars on the planet, mostly fueled by petroleum (gasoline/petrol and diesel). If electric cars are so much better for the environment, why aren't we all driving them? There's one good scientific reason. For all their very bad points, petroleum fuels are very good at storing energy. As you can see in this chart, 1kg of gasoline can store ~70 times more energy than 1kg of lithium ion batteries. As an energy storing chemical, hydrogen is even better - but has many other problems. We need better ways to store energy!
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