WATCH: Used cooking oil like this is being converted into biodiesel in a plant in the oil-rich United Arab Emirates
It is 11am in Dubai and already 42 degrees Celsius outside. Inside the warehouse it is barely any cooler.
Although workplaces in the United Arab Emirates are normally fitted with air conditioning, here they have purposefully restricted it to the offices.
"It's the chemical reactions," Karl Feilder, chairman of Neutral Fuels explains.
"They happen at 65 degrees so by keeping the factory temperature higher we expend less energy on the process.
"That makes it more efficient. That's better for the environment and it cuts costs."
He is pointing at the thirty metre long collection of industrial tanks and pipes through which the firm's main product is being made.
The room smells a bit like a chip shop. There is a reason for that.
They are making biodiesel - converting vegetable oil from local McDonald's restaurants so that it can be used to fuel trucks.
http://www.bbc.co.uk/news/business-14619678
Note: 22 August 2011 Last updated at 23:05 GMT