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.
Space Junk Could Threaten Space Station
The mid-October explosion of a the upper stage of a Russian rocket has produced a cloud of space junk which would threaten the space station. The explosion produced about 500 pieces of debris, which have joined the ~21,000 pieces of space junk bigger than 10 centimetres that NASA tracks as a potential danger to the space station. For more information about this incident, go to http://www.spacedaily.com/reports/Record_space_junk_cloud_could_threaten_ISS_report_999.html. For more information about space debris, go to the Windows to the Universe space junk page, and enjoy our Junk in Space game.
