What it means is the earth, the solar system and the universe has a rythm. The Vostok Ice Cores are combined data from scientist from Russia, France and the USA gathered in 1998 at Vostok Ice Station in East Antarctica Russia. Each country took the cores and independently evaluated the data. The graphs are the results of that study combining all the countries independent results. Look at the graphs and tell me it doesn't look a rythmical heatbeat. At the end of the day we have zero effect on the earths climate.