Answer:
Global warming is important. We need to stop it. Although it may seem good as in a nice long summer, it isn’t. In Antarctica, polar ice caps are melting, peinguins, polar bears and any other attic animals are homeless because we are too lazy to pick up our own litter after ourselves. If we don’t stop soon, the world as we know it will be flooding and people will be living on tiny islands.
C.A writer uses an object to represent significant ideas or qualities
Is - two billion dollars is a unit, one unit so it is singular and you use the singular verb
think - scientists is a plural, therefore, you must use the plural verb form of think
