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Another month, another carbon dioxide record. This time the record extends beyond the rocky slopes of Mauna Loa, Hawaii, home to the most storied carbon dioxide record, and includes 39 other sites around the globe to paint a troubling picture of a greenhouse gas rise with no signs of slowing down.

An interesting bit on efforts to clone a giant redwood tree and plant saplings from that tree in an effort to increase the amount of carbon absorbed from the environment.

Over the last few days a thick, grey fog has enveloped the Chinese capital, sending levels of particulate matter - the unit of measuring air pollution - into deeply hazardous territory. Levels of particulate matter 2.5, which can penetrate human lungs and cause respiratory ailments, heart attacks and other health impacts, peaked near 600 micrograms per cubic meter of air in the city. The World Health Organization standard for healthy air is just 25 micrograms per cubic meter.