Is it a bad idea to buy a new diesel car?

I need a 4x4 to tow 3.5 tonnes. I'm looking to buy a new Land Rover Defender 90, which is diesel. With current emission targets, would it be a really bad idea to buy a pure diesel now if they are going...

Will the Land Rover Defender be offered as a hybrid in future?

Do you know if Land Rover are planning hybrid versions of the Defender or Discovery?