During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm repeatedly. Daily levels of CO2 can vary due to weather, and there are seasonal trends as well.
Planet Found in Sweet Spot
Astronomers have recently discovered a planet in a "sweet spot" habitable region, relative to the star in its solar system HD 40307, which could potentially have water at its surface. The planet, which is seven times as massive as Earth, is only 42 light-years away in the constellation Pictor. For more information about this discovery, visit http://devel.sn-web01.sciencenews.org/view/generic/id/346320/description/Super-Earth_joins_ranks_in_life-supporting_zone.
