Non vascular plants cause the ice age

URL:http://news.sciencemag.org/sciencenow/2012/02/did-plants-freeze-the-planet.html
Article: Did Plants Freeze the Planet?
Author: Sid Perkins
Date: 1 February 2012
Summary:
Scientists have concluded that the introduction of plants, such as moss, are cause of the ice age. At that period of time, the CO2 concentration in the air was 14-22 times the current level. The presence of moss increased the amount of chemical weathering of silicate rocks. These rocks then reacted with oxygen and acid rain, slowly pulling CO2 from the atmosphere to form carbonate minerals that would temporarily lock away the CO2. By slowly taking away the CO2 the atmosphere temperature dropped, forcing the planet into an ice age.
Relativity:
In class we are learning about non vascular plants like moss.