the day after tomorrow..20點!!

Answer

1) Jack is smart because he knows the trouble is coming.
Jack love his son Sam and took a risk to save him.
Sam is also very smart and tried his best to keep his life

2) Global Warming means the world temparture is going up because of the world pollution.

3) The great climate change is because of global warming. The ice water from the polar make the whole world colder and freezer.