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.
Venus, Jupiter, and Moon Alignment This Weekend!
We're in for a treat this weekend!
On Saturday and Sunday, the Moon, Jupiter, and Venus will be lining up in the western sky. The two planets are approaching 10 degrees apart in the sky by the end of the month. You can see all three at twilight, when the crescent Moon is also visible. For more information, see http://www.weather.com/outlook/weather-news/news/articles/venus-jupiter-moon-offer-night-show_2012-02-24.
