Setps to be taken to reduce pollution from transport

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One of my friend started a discussion regarding battery driven cars which is a great way to reduce pollution. But several other steps should be taken for reducing transport pollution and increasing energy efficiency. 1) public transport should be encouraged instead of individual cars. 2) roads should be smooth so that the cars become more efficient. 3) When travelling for long distance the windows of the cars should be closed whenever possible. 4) cars should be lighter. More efficiency means we require less fuel. Less fuel means less combustion. Less combustion means less emission. Less emission means less pollution. Less pollution means a BETTER WORLD.