nationalobserver.com
Last year, the global concentration of carbon dioxide jumped by 3.5 parts per million (ppm) and reached 424 ppm, the biggest jump since modern measurements began in the 1950s. The WMO says the blanket of heat-trapping gas is now at levels not seen in at least 800,000 years — much longer than homo sapiens has existed on Earth, let alone human civilizations.
12 months ago