Plate tectonics changed everything and they still do today. It matters where are in the world. Like if you are in one place that had mountains you wouldn’t think that I could be in a really hot place. Moving continents have drastically changed Earth's climate.
Some effects that the plate tectonics had on the earth's atmosphere is that the changed water currents, made higher altitudes, and made volcanic activity to decrease.
By blocking and opening big straits, it causes the circulation of the currents in some places to be very strong. Which then changes all of the other currents. Scientists say: Climate has an effect on Plate Tectonics! - Oxford University, Environmental Research Doctoral Training Partnership, DTP
Some other things that plate tectonics have changed are rain shadows. We wouldn't have them if it weren't for hills and mountains. Created by plate tectonics. FUN-FACT: the plates move 3cm every year. http://www.brighthub.com/environment/science-environmental/articles/74098.aspx