If a planet becomes too hot then that planet cannot sustain life, and global warming linked to human emissions of heat-trapping gases is changing the planet's climate. Given these facts, global warming most threatens the Earth's ability to do what among the following options:
- Sustain life
 - reproduce
 - Melt polar ice caps
 - growth
 - protect them
 - Resist erosion
 - to move people
 - Produce fossil fuels


 

 Sustain life        