Earth crosses 400 ppm carbon dioxide threshold
As per Climate Central reports, the Earth "permanently" passed a symbolic carbon dioxide threshold of 400 parts-per-million (ppm) in September. Higher carbon dioxide levels have resulted in greater global warming impacts with the Earth edging right up against the 1.5ºC warming threshold compared to the 1881-1910 average. Notably, July 2016 was the hottest recorded month in Earth's history.