The video discusses the impact of exhaust emissions on global warming and highlights research efforts to develop cleaner diesel engines. It covers the efficiency of modern diesel engines and the research on heat flow to improve engine design. The video also explores the production of biodiesel from vegetable oil and its potential as a future energy source, emphasizing the chemical processes involved in reducing viscosity while retaining energy content.

What is the primary environmental concern associated with exhaust emissions?

• Increased levels of nitrogen

• High levels of carbon dioxide and global warming

• Depletion of the ozone layer

• Acid rain formation

How do modern diesel engines compare to those from seven years ago in terms of emissions?

• They produce the same amount of emissions

• They produce 50% less emissions

• They produce 50% more emissions

• They produce no emissions

What is the main advantage of diesel engines over petrol engines?

• Higher emissions

• Lower fuel consumption

• Higher cost

• More noise

What is the source of the vegetable oil used in the biodiesel production at the University of the West of England?

• Extracted from algae

• Recovered from the university's canteen

• Imported from other countries

• Purchased from local markets

What is the process used to reduce the viscosity of vegetable oils for biodiesel production?

• Heating the oil

• Adding water

• Chemically breaking down triglycerides

• Mixing with petrol