Because many people simply don't believe statistics anymore. Each group giving them out seems to have an agenda and a twist.
If it was that bad it would not be allowed.
If you don't believe a statistic, try and find out if it's true or not. Often it's not that hard.
I found out today that one of the main sources of insight into the health effects of pollution is a study that says this: "Applied to environmental policy, taking a permanent 50% to 70% reduction of PM10 as a reasonable goal, one finds a corresponding increase of average life expectancy in urban areas of EU and USA by roughly four months."
Given that diesel is just one of many causes of pollution, the effect must be pretty small.
Here's a question: how does something become "not allowed" unless it's already done enough damage to overcome our skepticism about statistics?
I've heard that wood burning stoves are pretty bad pollutants, and we seem to be going through a fad of fitting them everywhere we can.
All said and done, it comes down to whether each person wants to make a contribution to having cleaner air. Arguing about petrol and diesel isn't the answer. My plug-in hybrid isn't the answer. An electric vehicle could be, although I suspect that fewer coal-fired power stations would be helpful as well. I wouldn't be surprised if improving the insulation of your house is the best thing to do.
Ramble over.
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