# Transcript

Voice over
There is now virtually no prospect of holding temperatures to 2 degrees if the science is correct. We're now talking about catastrophic climate change.
Biofuel scientist
What we have here is algae. Algae communicate by releasing chemicals, and the golden chalice is if we can find the chemical that they're producing that says to the other algae let's make more oil.
John Craven
But how close are you to this becoming anything like a commercial reality?
Presenter
What you're seeing in there is used cooking oil we've pumped over to the reactor and you end up with the biodiesel itself.
News reporter
Hydrogen could provide the ultimate renewable and clean fuel.
The consensus is among many in the motor industry that hydrogen really is the way ahead, the cure for so many of the motor industry's fuel problems, but there are major obstacles in the way. Of course there needs to be huge investment in the infrastructure, and we also need to be persuaded that hydrogen cars can be successful.
News reporter
You used to only see electric cars at motor shows as designers showed off their visions of the future. Now, though, manufacturers are racing each other to get electric cars onto the roads.
Quentin Willson
All these technologies need to be tested so we see which is the best. They may run parallel but what we've got to do is start looking at an alternative to the shackles of oil.
Voice over
There are very few things that can't be made in other products. The reason why it hasn't happened as fast as it ought to happen from environment perspectives is not that it can't happen, it's that the alternative's been too cheap.