What sources meet most of the world's energy needs today?

The correct answer highlights the significant contributions of water power, coal, and petroleum to the global energy supply. These energy sources have historically played a pivotal role in meeting the majority of energy demands across various sectors, including transportation, electricity, and industrial processes.

Petroleum is particularly crucial as it fuels transportation and is integral to many industrial activities. It remains one of the most consumed forms of energy worldwide, providing a substantial portion of the energy used daily.

Coal, while facing decreasing use in some regions due to environmental considerations, has been a staple source of electricity generation and continues to be a dominant energy source in various developing countries. Its affordability and availability have made it a reliable option for energy generation.

Water power, or hydropower, utilizes the flow of water to generate electricity, contributing to renewable energy sources. While it accounts for a smaller portion compared to fossil fuels, it is still significant, especially in countries with abundant water resources.

The combination of these three sources reflects the historical reliance on traditional energy forms that have shaped global energy consumption patterns, particularly before the recent shift towards more renewable and cleaner energy sources.