Record warm November continues the trend of a record hot 2015.
2015 marked the first time since recordkeeping began that the global average temperature climbed to more than 1°C (1.8°F) above pre-industrial levels.
Atmospheric CO2 has reached a concentration unseen for more than 400,000 years, up 33 percent in the last century.
Increasing greenhouse gases are the overwhelming reason why 2015 will be the hottest year on record.
Global average temperatures are generally higher in El Niño years vs. La Niña years.
Daily record highs are outpacing record lows across the U.S. due to climate change.
In a more acidic ocean, shellfish, plankton and corals struggle to adapt.
CO2 mixes with seawater to form carbonic acid, making the oceans more acidic.