How do scientists predict future trends in climate

Scientists can have the ability to predict future trends in climate because they may have compared the climate of the present to the climates of the past.

Reason: Meteorologist or, people who studies weather or climate patterns in a area used previous studies to predict how things may turn out.

  For example in Florida, the climate is mostly hot and/or humid. This is because it is mostly hot and/or humid in Florida. Meteorologist use the previous climate of Florida (which is hot and/or humid) to predict that Florida will be in the future (which may be a literal oven0-0). Scientists also use this method to predict rain falls, storms, and even the Hurricane Seasons.

(Hope this helps you : ) )