PLEA Network

2 August 2016, Carbon Brief, Scientists confirm multiple climate records broken in 2015. Last year saw records in the Earth’s climate system continue to tumble, says the latest State of the Climate report from the US National Oceanic and Atmospheric Administration (NOAA). The 300-page report, now in its 26th year, is an annual assessment of the world’s climate, scrutinising the Earth’s land, oceans, ice and atmosphere. It is compiled by more than 450 scientists from 62 countries. Carbon Brief takes a look at how rising greenhouse gas emissions, with the help of a strong El Niño event, made 2015 into a record-breaker. Greenhouse gases Last year was record-breaking for concentrations of all three of the main long-lived greenhouse gases that contribute to climate change: carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). At the Mauna Loa Observatory, where scientists have been monitoring CO2 since the 1950s, the average concentration for the year as a whole surpassed 400 parts per million (ppm) for the first time. At 400.8ppm, CO2 levels in the atmosphere were 3.1ppm greater than 2014 – the largest annual increase of the 58-year record. In addition, March 2015 was the first time average CO2 concentration across the globe has been more than 400ppm for an entire month. Global annual average CO2 levels for 2015 finished just shy of the 400ppm milestone, at 399.4 ppm. You can see this in the chart below, one of several graphics produced alongside the report. Meanwhile, levels of both methane and nitrous oxides reached new record highs in 2015, at 1834.0 parts per billion (ppb) and 328.2ppb, respectively. Read More here