Hey Mr.Wood, This is Victoria from period 1. On the chart on NASA the chart shows the carbon dioxide and through out the years it changes from really high, high, low an its lowest. Currently we are at 390.45ppm. Every day our land builds up and sometimes become ice and it could push through out the land and could eventually ruin our homes and animal lifes there would be no plants to help us survive. thanks alot we miss you your student, Shubin, Victoria