Task: Question Answering
Input (English): Question: Billionaire Joey McMoneystuffs added 3 new jets to his already large fleet of personal aircraft. One day, he decided not to have them race each other, burning no fuel and adding no greenhouse gases to the atmosphere. The Earth's heat index will 
 Option1: increase 
 Option2: decrease 
 Explanation: If there are more greenhouse gases in the atmosphere, more ultraviolet radiation will be trapped and the Earth will heat up.
Output (English): decrease