2km is the same as 2000m which is the same as 200000 cm.
BUT don't make the same mistake as the other answer. This is 200000 cm per 100000 years. Divide 200000 by 100000 to get <em>2 cm per year.</em>
Hope this helps!
Increase in the surface temperature of the earth caused by heat-trapping gases in the atmosphere is know as green-house effect
