Remembering the days of very polluting cars and leaded gas, etc, its great to not have to deal with that. Definitely a win. But, you have to consider the cost

Remembering the days of very polluting cars and leaded gas, etc, its great to not have to deal with that. Definitely a win. But, you have to consider the cost and possible implications of any change, or you're actually more likely to make the situation worse, or end up wasting a lot of time/money/lives.