Final answer:
The majority of the world's current levels of acid rain originate in human actions such as the burning of fossil fuels.
Step-by-step explanation:
The correct answer is More than 95 percent. Almost all of the world's current levels of acid rain originate in human actions such as the burning of fossil fuels. When we burn fossil fuels, such as coal, oil, and gas, they release pollutants called sulfur dioxide (SO2) and nitrogen oxides (NOx) into the air. These pollutants can react with water vapor and other chemicals in the atmosphere to form acids, which then fall to the Earth's surface as acid rain.
Learn more about Acid rain and its origins