Compare the pros and cons of a fuel cell, such as the hydrogen-oxygen fuel cell, and a coal-fired power station for generating electricity.

In terms of environmental impact, the hydrogen-oxygen fuel cell has the advantage as its operation results in water being the only by-product, compared to the significant greenhouse gas emissions from a coal-fired power station. However, fuel cells require a steady supply of hydrogen which may be costly and could pose storage challenges. In terms of efficiency, a hydrogen fuel cell can convert around 60% of the chemical energy in hydrogen into electrical energy, which is significantly higher than the 40% efficiency typical of coal-fired power plants. However, coal power stations have been around for a longer period, are well-developed, and utilize resources that are currently abundant and cheap. Potential improvements in hydrogen storage and production technology may shift this balance in the future.