They enable us to feed our population. The global trade network have lifted billions of people out of poverty. Global literacy is at the highest it has always been. Fossil fuels enable us to be able to accurately track and predict hurricanes. Basically, our whole modern economy is built on fossil fuels.
The most valuable resource on earth is human knowledge and ingenuity. Thanks to our high population, reduction of poverty, and global education, that resource is the highest it has ever been.