Since 1750, carbon dioxide, methane, and nitrous oxide have increased and now exceed pre-industrial values.
The most important anthropogenic greenhouse gas is carbon dioxide, the global atmospheric concentration of carbon has increased from 2005, and if 2005 it exceeded the natural amount.
Methane, also had increased in the 1990s. Growth rates have declined same time methane had increased, it is consistent with the total emissions. Nitrous oxide has also increased as well in 2005.
The water level has increased as well, mountain glaciers and snow cover have declined in both hemispheres because of water levels rising.
It is said to be likely that the greenhouse gas concentration would have increased more warming and that could have lead to this rising of water levels.
"Both past and future anthropogenic carbon dioxide emissions will continue to contribute to warming and sea level rise for more than a millennium, due to the timescales required for removal of this gas from the atmosphere". (Thomas Easton)
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