Sentences with phrase «global carbon dioxide levels»

Heat wasn't the only arena where records were set: Preliminary data from NOAA suggests that 2015 saw the biggest single - year leap in global carbon dioxide levels, and Arctic sea ice saw a record low winter maximum and its fourth lowest summer minimum.

Yesterday, NOAA scientists reported that in March 2015 the monthly average global carbon dioxide level went above 400 parts per million for the first time.

Because of the precipitous rise of global carbon dioxide levels, photosynthesizing grasses have an improved food source.

Olson and her team are asking the federal court in Oregon to order the US government to create a comprehensive plan to help lower global carbon dioxide levels to 350 parts per million, which they claim is what the government's own scientists recommended in 1990.

«The connection to carbon dioxide levels is not clear,» he adds, «but we do raise the provocative idea that the last time global carbon dioxide levels were rising in the past, adding iron to the equatorial Pacific Ocean may have acted to lower these levels to some extent.»

Antarctica was also more sensitive to global carbon dioxide levels, Cuffey said, which increased as the global temperature increased because of changing ocean currents that caused upwelling of carbon - dioxide - rich waters from the depths of the ocean.

Global carbon dioxide levels have risen from a preindustrial level of about 280 parts per million to nearly 400 ppm today.

When Keeling began his project in 1958 the global carbon dioxide level was about 337 parts per million, already up from the preindustrial levels of about 280 parts per million.