Well I believe that they are currently working on Petrol compression ignition engines which are supposedly going to be better than an oil burning Ddiesel engine.
I personally am not convinced that given an equal tax footing that Diesel is better than petrol.
A supercharged Petrol engine gives the Torque of a diesel and the drivability of a Petrol engine. They are cheaper to builds and to service and a lot more fun to drive.
Every one is worried about Carbon dioxide in the Atmosphere and Global warming yet Carbon Dioxide are at the lowest levels that the Earth has ever seen.
An Ice Age is imminent.
The Swiss will again be living under 3 miles of Ice.
Europe will again be uninhabitable.
Australia will be scoured by high winds.
The last ice age ended in about one human generation. When the next ice age returns it will probably return in about one generation.
We have an ice age about every 100,000 years.
And countries like Norway only exist from under the ice for about 12,000 years before going back to being totally under the ice for another 90,000 years.