You have a good point but only stopping two-stroke engines is not going to help. Single person car driving is a big problem and cab sharing is still premature. I think these are by-products of the poor public transport. Major cities don't have fully connected subway system, inter-city public transport is even worse, be it railways (sigh!) or public buses.
Other bigger factors to pollution are industries and electricity production. Curbing pollution is not possible if country/states are not very concerned about it, be it regulating the industries, making better public transport or focusing on renewable energy. Problem is, some of the leaders are focused on politics and others care only about growth and economics. They don't even think that pollution is a real issue. And those who care and think about it, are not allowed to live and do their work!
Other bigger factors to pollution are industries and electricity production. Curbing pollution is not possible if country/states are not very concerned about it, be it regulating the industries, making better public transport or focusing on renewable energy. Problem is, some of the leaders are focused on politics and others care only about growth and economics. They don't even think that pollution is a real issue. And those who care and think about it, are not allowed to live and do their work!