What year did scientists discover the acid rain phenomenon in New Hampshire?

• 1970

• 1963

• 1985

• 1990

What was the pH level of rain that interacted with harmful gases?

• 7.0

• 8.5

• 5.4

• 3.7

What natural events can cause oxides of nitrogen and sulfur dioxide?

• Earthquakes

• Tornadoes

• Volcanic eruptions and lightning strikes

• Forest fires

What did companies initially do in response to acid rain research?

• Immediately reduced emissions

• Denied responsibility and doubted the research

• Funded alternative energy research

• Launched public awareness campaigns

What was a major source of sulfur dioxide emissions?

• Hydroelectric dams

• Power plants

• Wind turbines

• Solar panels

What is the 'cap and trade' system?

• A program to plant trees for every ton of CO2 emitted

• A method to increase pollution

• A system to limit and trade emissions allowances

• A policy to ban all industrial emissions

What was a criticism of the 'cap and trade' system?

• It was too strict on pollution limits

• It allowed for trading of pollution allowances

• It was considered a license to pollute

• It completely banned sulfur dioxide emissions

How did some power plants reduce their sulfur dioxide emissions?

• By shutting down operations

• By using solar energy

• By adding desulfurizing scrubbers

• By increasing coal usage

How have some ecosystems begun to recover from acid rain?

• Through global cooling efforts

• Through human intervention and reintroducing organisms

• By natural processes only

• By banning all industrial activity

Which countries still struggle with acid rain due to high-sulfur coal?

• USA and Canada

• Australia and New Zealand

• Russia, India, and China

• Germany and France