A recent research has claimed that there is no breather as far as from rising carbon dioxide levels in the atmosphere are concerned. As per latest study by the National Oceanic and Atmospheric Administration's Earth System Research Lab, the said levels are at its peak from over five million years.

It is highly likely that they will reach top 400 parts per million in the Northern Hemisphere next month. It was on Monday that Hawaii's Mauna Loa Observatory tracked down CO2 levels in the air of 398.36 parts per million (ppm). It can be said that carbon dioxide will soon touch 400 ppm for the first time in human existence.

It is believed that this is just another milestone on humanity's journey towards a damaging climate. "It's an important threshold. It is an indication that we're in a different world", said climatologist Chris Field. "It typically gets to a peak concentration above that of the rest of the world due to winds blowing CO2 up north in the spring".

It has been also mentioned in an article in 2009 that when CO2 concentrations were sustained at this level 15 million years ago, it raised the temperature 5° to 10°F warmer and seas were 75 to 120 feet higher.