Fact 1: Global warming is when worldwide temperature increases.

Fact 2: Temperature Temperature is an measurement of the amount of heat.

Given the two facts above, answer the question "What is it called when worldwide heat increases?" with the following options: 
- global warming
 - threatened
 - acid rain
 - river pollution
 - climate
 - kinetic energy
 - global warmer
 - hyperthyroidism


 

 global warming        