Answer & Solution
The correct answer is “Only 2”.
The Intergovernmental Panel on Climate Change (IPCC) emphasizes the need for deep, rapid, and sustained reductions in greenhouse gas emissions to limit global warming and mitigate climate change.
Gradual and limited reductions are not considered sufficient to meet the targets set by the Paris Agreement, particularly the goal of limiting global temperature rise to 1.5°C or 2°C above pre-industrial levels.