Which one of the following fuels is the most sustainable? A - VCE - SSCE Chemistry - Question 2 - 2012 - Paper 1

When considering the sustainability of fuels, we need to evaluate their environmental impact, renewability, and long-term availability.

A. Biodiesel - This is derived from biological sources and, unlike fossil fuels, is renewable. The production of biodiesel can utilize waste products, which enhances its sustainability.

B. Uranium - While uranium is used in nuclear energy production, it is a non-renewable resource and raises concerns about radioactive waste and environmental impact over time.

C. Brown coal - Also known as lignite, it is the least energy-dense and most polluting of all the fossil fuels. Its combustion releases significant greenhouse gases, leading to environmental degradation.

D. Natural gas - Though cleaner than other fossil fuels in terms of CO2 emissions, it is still a non-renewable resource and contributes to greenhouse gas emissions.

Considering these factors, biodiesel (A) is the most sustainable option as it is renewable and has a lesser overall environmental impact compared to the other options.