Transport is Ireland's greatest challenge in reducing emissions. All other contributors to greenhouse gases have been controlled in some way, however transport is out of control. Eco Eye looks at all our current problems; the worrying trend of commuters travelling long distances, the negative effects of urban sprawl, oil prices, and public transport that desperately needs to evolve. Duncan looks at future plans and solutions for public transport, in particular, Transport 21, and talks to all the key players. Eco Eye looks at ways of getting people out of their cars and onto public transport, and predicts the future for the private car. This is the second special in the series, and it is particularly relevant for Ireland and our present situation. If we don't make major changes now, it is predicted that transport will account for 40 per cent of our CO2 emissions by 2010.