the strong co2 effect has been observed by many different measurements.
the strong co2 effect has been observed by many different measurements.
physical impacts of climate change:148
large-scale measurements of sea-ice have only been possible since the satellite era, but through looking at a number of different satellite estimates, it has been determined that september arctic sea ice has decreased between 1973 and 2007 at a rate of about -10% +/- 0.3% per decade.