In April 2004 the monthly average concentration of carbon dioxide measured at Mauna Loa, Hawaii, reached 380.5 parts per million for the first time. Before the Industrial Revolution the air held about 280 ppm, a level that ice cores show had not been exceeded for hundreds of thousands of years. The NOAA record shows the concentration climbing a little faster almost every decade. It took place in April 2004.
Before and after
- 2 March 2004Launch of Philae
- 2 March 2004Launch of Rosetta
- 11 March 20042004 Madrid train bombings
- 16 March 2004Insurgency in Khyber Pakhtunkhwa
- April 2004Carbon dioxide passes 380 ppm at Mauna Loa
- 31 May 2004Premiere of Peppa Pig
- 1 June 2004Discovery of Methone
- June 2004Discovery of Anthe
- June 2004Houthi insurgency
More in Earth & climate
- 8 April 1949Establishment of Plitvice Lakes National Park
- 1980Establishment of Komodo National Park
- 1997Establishment of Lorentz National Park
- from 3 November 2013 to 11 November 2013Typhoon Haiyan
- 8 September 20232023 Marrakesh-Safi earthquake
- May 20262026 European heatwaves
The era
This moment belongs to the Contemporary world (1945 CE to today), the world since 1945. You can also browse everything in the 21st century.