"IF THE best way to create the future is to invent it, we say the second-best way is to finance it." John Doerr is only half joking. He is one of the most influential venture capitalists in Silicon Valley, and he knows a thing or two about financing the future. But ask him what he's focused on now and you won't hear venture-capital buzz-phrases such as "Web 2.0". These days, Doerr is firmly focused on clean technology - and in particular, energy technologies that can save the planet from global warming.

Anyone clinging to the notion that we can wipe the slate clean of all our climate mistakes by deflecting the sun's rays with space mirrors is in for a disappointment. Dan Lunt of the University of Bristol, UK, and colleagues carried out the most detailed climate-modelling study to date on the impact of a sunshade.

If there are many left turns on a road, then a bus lane on the extreme left will hamper other traffic turning left or turning into traffic. It also means that every time the bus has to stop for

Cyclists rarely figure in debates on traffic but if you take the BRT corridor early morning it will be difficult to miss hundreds of commuters pedalling to work on the bicycle lane. On average

Public transport is the only answer to congestion and pollution The present crisis demands new solutions. And the solution is public transport, for space to accommodate cars is limited and

The city of Bogota, Columbia, is famous for its BRT project. This is one of the first successful BRT models, and the Delhi BRT is based on it. The BRT system in Bogota, TransMilenio, carries over

On April 21, a small stretch of road in a congested corner of south Delhi, one of the most polluted cities in the world, turned into an epicentre of chaos, confusion and downright indignation.