Diesel engines need to be eliminated over time because of the effects of pollution they cause.

With possible improvements in technology for storing electric energy, maybe we could replace them with electric vehicles.

Australia's government is accused of sabotaging climate negotiations by insisting on legally binding targets.

This may be true in a narrow tactical sense. However, the US and China, by rejecting legally binding targets, are doing their part to make these talks fail to reach their goal. Just when the world needs the mother of all crash programs, governments that bow down to fossil fuel companies are blocking it from happening.

Nuclear weapons on instant launch readiness pose a risk of accidental war, while stockpiles are not secure enough and could tempt thieves.

Perhaps the US, Russia and China could agree to mutual observation of each others' launch vehicles to verify that they are not being readied for launch.

Uber has been banned in Delhi after a driver raped a passenger.

Campaigning to prove benzene responsible for leukemia.