Who is best known for his testimony on climate change to congressional committees in the 1980s, Which helped raise wider awareness of the global warming issue?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. James Hansen.
James Hansen is best known for his pivotal testimony on climate change to US congressional committees in the 1980s, particularly in 1988. As a NASA climate scientist, his testimony explicitly stated that global warming was underway and that there was a strong cause-and-effect relationship between the greenhouse effect and observed temperature increases. This widely publicized testimony significantly helped raise public and political awareness of the global warming issue, marking a turning point in the public discourse on climate change.