Final answer:
The major reason why renewable energy use is growing is environmental concerns due to climate change. Financial dis-incentives to using fossil fuels and the need for energy security have also contributed to the shift towards renewable energy sources.
Step-by-step explanation:
The major reason why renewable energy use is growing is environmental concerns. Climate change concerns have led to politically enforced financial dis-incentives to using fossil fuels, resulting in a migration towards renewable energy sources. Additionally, the increasing price and volatility of oil prices, as well as the dependence on foreign oil, have spurred interest in renewable alternatives to ensure energy security.